Breaking Bard

[My Self]

Would any of these be balanced Bard archetypes?

Alchemical Bard:

I was thinking to replace the casting with alchemy (duh), give Alchemist discoveries instead of Versatile Performance (keyed off of CHA instead of INT, if applicable), switch Well-Versed with Brew Potion and the option to use CHA instead of INT with Craft (Alchemy), and Jack of All Trades with Poison Resistance equal to 1/2 level, which becomes Poison Immunity at 20th level.

Basically:
1st: (Replaces Spellcasting) Replace spells with Alchemy, keyed off of CHA instead of INT.
2nd: (Replaces Well-Versed) Get Brew Potion, and let Craft (Alchemy) use CHA instead of INT. (Replaces Versatile Performance) Get an Alchemist Discovery.
6th: Get an Alchemist Discovery.
10th: (Replaces Jack of All Trades) Get Poison Resistance equal to 1/2 level. Get an Alchemist Discovery.
14th: Get an Alchemist Discovery.
18th: Get an Alchemist Discovery.
20th: Get Poison Immunity.

Second archetype-ish thing:

More Performance Bard:

The idea would be to simplify Bardic Performance spending. Perhaps only the Bard's active abilities would expend performance, while things you want to have always-on can be done cheaply. The Bard only has CHA+1/2 level uses of Bardic Performance, but it only costs 1 use of it to start one of the performances, and they can maintain any non-instantaneous performance for up to a minute, and continue a performance until the end of its duration if he interrupts it with a spell or another performance. (e.g. if a Bard is Inspiring Courage for 7 rounds, then casts Silence instead of having an 8th round, he can continue with a 9th and 10th round to finish off the minute, without spending extra uses of his performance)

Basically:
1st: (Alters Bardic Performance) Bardic Performance has CHA+1/2 level uses, but can be sustained for up to 1 minute per use (instead of 1 round). Casting spells or starting other performances during a performance pause the effects of the first performance and count towards its duration, but allow the performer to finish the first performance without spending additional uses.

Third archetype-ish thing:

More Casting Bard:

This would alter Bardic Performance and spellcasting so that both are combined. The Bard would get CHA+3*(level+1) uses of Bardic Performance per day (instead of CHA+2*(level+1) uses). Starting a performance is never quicker than a standard action. Spells would have a DC of 10+CHA+1/2 level. Bards would know 1 less spell per level and have no traditional spell slots, but could cast spells while using Bardic Performance, without spending additional actions. They could cast spells of their highest level after 3 rounds of using Bardic Performance, spells of their second-highest level over the course of 2 rounds, and spells of their third highest level in one round. However, spells cast this way do not provoke attacks of opportunity and get a +10 circumstance bonus to concentration checks. Bards could treat a spell as 1 spell level lower for this purpose by spending a full round action only performing. Cantrips could be cast without using rounds of Bardic Performance, although they could still be cast as part of this. At 20th level, you treat all spells as 1 spell level lower to determine casting time.

Basically:
1st: (Alters Bardic Performance, Spellcasting) 6+CHA rounds of Bardic Performance at 1st level. Lots of casting changes listed above.
20th: Can cast 6th level spells every round while performing.

[Amanuensis]

1) I have trouble imagining an alchemical bard flavor-wise. Why wouldn't I play an alchemist instead?
I guess I can see a medicine man who uses a mix of drugs and performances to put himself into trance. That would work better as an alchemist archetype though.

2) I think that is unnecessary, any mid-level bard has enough rounds of performance to last throughout an adventuring day without being stingy. If that is not enough for some reason, Lingering Performance also helps a bard to make his bardic performance last longer. By the way, casting a spell does not disrupt a performance.

3) I'm not sure if I understand this correctly. Does the spell's casting time increase to 2 or 3 rounds? Or can I cast these spells after a certain amount of time spent performing for free?
Anyway, I think a better way to implement the concept of a casting-focused bard is to introduce more Bardic Masterpieces which often mimic spell effects. That way, you can use rounds of performance for spell-casting and you have a bigger selection of spells at the same time.

[My Self]

For #2, the idea is that any bard of any level gains a good number of uses of each thing without having to micromanage a number of rounds. Perhaps the language about spells should be dropped, but the idea is that once you start a performance with a duration, you can use that performance any time during the duration.

Example:
Round 1: Starts Inspire Courage
Round 2: Starts Dirge of Doom
Round 3: Starts Fascinate
Rounds 4-10: Can continue Inspire Courage, Dirge of Doom, or Fascinate
Round 11: Can continue Dirge of Doom or Fascinate
Rounds 12: Can continue Fascinate

For #3, you declare that you are going to cast a spell of a certain level or lower (but don't need to specify the spell, then you perform one of your Bardic Performances for a number of rounds, then you cast it. So yes, the casting time increases to 2 or 3 rounds, but it also occurs basically for free - whenever you are using a Bardic Performance, you can be casting a spell without spending any additional actions or resources.