Depending on how close you want to keep to the way 3.5 does it, you'll need to throw in some Bonus Feats. One every 3 or 4 levels should do it.
Other than what you've mentioned (and the 2 things below) there really isn't much TO do on Epic Progressions.
almost seems a touch weak.
A dread weapon excels at attacking one type of creature. Against its designated foe, its effective enhancement bonus is +4 better than its normal enhancement bonus. Further, it deals +4d6 points of bonus damage against the foe, and if it scores a successful critical hit against the foe, that creature must make a Fortitude save (DC 27) or be destroyed instantly and turned to dust. (This even affects creatures immune to critical hits or death magic.)
I only say it is weak due to the Inquisitor getting Greater Bane at 12th.
5th, Bane, +2 to Enhancement bonus, +2d6 damage.
12th, Greater Bane, +2 to Enhancement bonus, +4d6 damage.
2?th, Dread, +4 to Enhancement bonus, +4d6 damage, potential Instant Death on Critical and Fort Save.
On a non-crit you're only gaining +2 to-hit and damage over Greater Bane.
Granted, the Instant Death is nice, but...
Maybe go straight to "Greater Dread" and give +6d6 damage? It just seems to flow better.
Also, you may want to review the Domains/Inquisitions. I'm sure there's a few that scale oddly (either REALLY good after 20, or REALLY pointless after 20).