Fire/Fire/? Blapper help

[Furii]

I've got my fire/fire blaster to 50 and enjoying it. My current build has softcapped S/L defense and perma haste, but I feel there's more I can get out of it.  The aim is maximum damage, so I figured I need to get up close and personal to make use of my PBAoE's.

Does anyone have any better builds I can look at or comments about which powers you consider essential? I'm not sure about the following three.

 

Hot Feet: I initially passed on this but it looks like it actually puts out solid DPS. If you slot it well then you can slow mobs enough that the fear has no effect.

 

Combustion: Doesn't seem to really do much damage, and hardly ever hits multiple enemies.

 

Fire sword circle: Damage seems fine but I never hit anything because the radius is so small.