Suggestion for low-level healing spam fix.
Make the main healing out of combat. Resting let people do short 1 hour rests that heal them for 50% of the full night's rest. there could be a limit on how many times a day you can use it. I would suggest 1+con mod.
A full nights rest would be (1+2*con mod (minimum 1) )*level. (I have not tested this healing amount. It might need to be more.)
You could also get back 1 spell slot of each level limited at the same time 1+cha mod. This would make cha a stat that connects you to the magic in the world and lets you refill your magical energies with it.
A general feat could be Expert rester or something.
It makes you able to rest and get the benefits from con and cha one more time per day.
Suggestion for Cha dump stat fix.
The pool without feats would be +1 cha mod a general feat could add 2 points. This pool is only used to activate N/day abilities on items extra times or powering them up. If you are a level 10 character with a lantern of burning hands that has 1 charge per day and CL 4. You could use one point to heighten the caster level to your level. 10 in this example or you could spend one point to use the power one more time. You could also spend 3 points to cast 1 more time and heighten at the same time.
So it costs nothing to use potions and other consumables. It would be fine if you could power them up with resonance points.
The short rest could refill 1+1/2cha mod points to the pool.
Suggestion for Christmas tree effect fix.
Use the automatic bonus progression system from unchanged but update it a bit. For example, let people pick if they get mental or physical bonuses first.
I have not tested my suggestions but they are other wheys to fix the same problems. The numbers might need to change a bit.