Smite needs a complete redesign, full details here.
Basically Smite should have charges, much like the Arbites Mastiff pulse. 3 charges, 60 second regen. Primary fire would be unchanged.
Soulblaze stacks need to be capped at 16 stacks from all sources. (enough to horde clear chaff)
Perilous Combustion will need to be redesigned since Soulblaze cap will turn it into a mediocre Talent.