I find the prefered class bonus for humans in wizard and witch class to be lame compared to what the sorcerer gets. I came up with these alternatives below, let me know if they are balanced.
1) Memory Retention: choose a known spell & retain that information as per the spell mastery feat (you do not need your spellbook/familiar to memorize this spell).
2) Spell Shortcut: choose a known spell with a spell component of 1 gp or less - you may cast this spell without the component (per eschew component feat).
3) Frequent Repetition: choose a known spell - your frequent use of this spell makes it easier for you to cast under duress. You gain a +2 moral bonus to concentration checks casting this spell.
So, basically, you want to make Humans, who are already unreasonably good at everything, better at two of the more powerful classes? I'm entirely against this.
That aside, those look reasonably powered. I'd probably limit the first one to 1/2, so once every 2 levels.
The human as too good is open to debate, but in this case not an issue. I'm not offering up anything powerful here, merely trying to make the option worth taking. The sorcerer gains an extra spell known, which is damn good (too good, but what the hell, I like sorcerers). There is a dwarven trait that reduces the penalty for a non-prof weapon by 1 every time taken, the 4th time they gain that weapon proficiency - even if exotic. These, by comparison, are melba toast. At best, memory retention is equal to 1/5th of the feat spell mastery, not a very potent feat.