FWIW you might enjoy going enchantment over evocation, mass holds & such, or illusion (deep gnome) and t5 shadowdancer for weird.
I always preferred going undead vs warforged repair, mainly due to the passive aura heals buuur it's a real PITA to swap from dps gear to dreadkeepers etc yo refresh your auras (use both, and don't listen to the haters that say lesser is bad - it'll save you when you need it and it still debiffs via lgs/dino).
You could trade lv 18 EK core for 1monk/2rogue/17 wiz, to get +2 net imbue dice + SA dice, and with enough racial AP go drow for +2 more
37 minimum in EK, 12 minimum in harper, 13 minimum in PM, leaves 18.. so you could fit drow imbues in 80 ap....
For feats, consider taking adapt & master of forms - you can stay in fire stance for the stacking +1 crit multi on 19-20, or go water for dodge.
It's a super fun build, hope you enjoy it