Saboteurs are a like bit low in DPS, I think the better way to balance them is mage them apply on hit effects from enchanted weapons and greater planar essences when charges are detonated, actually only detonate active planar essences.

I ask the same for bard, he should apply on hit effects in cadence and codas.

Al else rogue souls are based on weapon type, attacks based on weapons and weapon enchants. Sabo and bard have around 0 synergy cause of this.