EK is a fairly weak DPS tree, unfortunately; always has been, but it looks even more gimp after the recent buffs to bards, pallies, etc.
I have a BF pal 15 / wiz 5 build which I made shortly after U19 came out to test EK. The DPS was pretty lackluster; fortunately, after U23 buffed pallies, I respecced more into pally PrEs and was a lot happier with it. Feats are the usual melee DPS, Addy Body, plus Quicken & Extend as my wiz metamagics. Enhancements: 16 APs in BF (PotF), 34 APs KotC (Avenging Cleave + Censure Outsiders), 13 APs SD (T3 Gtr Stance), 13 APs EK (Arcane Barrier), 1 AP AM (Jump SLA), with 3 APs left to tweak things. I haven't invested anything into ASF reduction, b/c my SPs are just for SLAs and Displacement, which aren't affected by ASF (no somatic component). Instead of Haste spell, use pots, Speed gear, or Blinding Speed feat. EDIT: black dragonscale docent has Haste Guard, so that's a good option too.
So essentially, I traded the extra melee DPS from KotC capstone for 2 extra feats and a bunch of survivability perks. Sorc instead of wiz nets you extra SPs, but you lose the two metamagic feats and you have to do either pal 14 / sorc 6 (giving up Zeal) or pal 15 / sorc 5 (giving up Displacement); so I decided the wiz option worked better overall.