Remove Memory Capacity!
Memory capacity is annoying to deal with and its an outdated mechanic that is hard to understand for new players. Knowledge is already responsible for cast speed and spell recovery. Magical interaction speed could be based on knowledge instead of will. Will is already responsible for magic damage bonus, magic damage reduction, buff/debuff duration already. Knowledge is more thematically fitting for magical interaction speed anyway. It is not worth to build spell cast speed instead of knowledge at any point of power right now anyway, so knowledge is always valuable.
Wizard does not struggle with memcap when built correctly.
Warlock is the same. (Unless 10 spell becomes viable)
Cleric 10 spell without gear could be a little problematic but can be adjusted easily.
Sorc in base gear is struggling but as soon as a little bit of gear is in play that, memcap is not an issue.
Casters scale better than than martial classes but a lot weaker without gear. Why not strech the power curve a tiny bit? The current halberd warlock meta could be supressed by casters (but this is also the issue of SSF).