looks pretty good, though i'm gonna say i'd like to see a sorc that can self-hjeal without being a robot. From a new player perspective is too hard (i know, UMD, heal scrolls, cocoon, blah blah. That's for an average/vet player, not a new one).
This one could have a toggle SLA that toggles a regen effect, it would be the same as the PM aura.
Maybe 3rd core (lvl 6) for a lesser regen aura and the 4th core (lvl 12) for a regen aura. These effects should be gained at higher lvls than PM's, because sorcs have some advantages over a wizard (spell points, and if you're not a robot DC casting becomes viable with less gear/PL's/etc)
granted i don't like to be a robot, may be not urgent but i'd still like to see that. Probably not a popular opinion though.
Edit: i skipped by accident one page of the post. Looks more popular than i thought. Regen fits with the hellish flavour me thinks, better than FL prolly.
edit 2: i skipped a lot, i'd give good feedback and not an idea just thrown there later overall, the tree is a good idea