I have a bow with soultrap but I'm looking to make something that does more damage when I'm not hunting souls. Straight fire/frost/shock or add paralysis or fear to the mix ( I have the double perk)? Or absorb health?

Absorb health is the best enchantment for a weapon period.

Weapon enchants should be tailored to your needs. There is no best ^^ (lol) Example: an invisibility user/steather would want absorb magica on his dagger/sword, and would find absolutely no value in absorb health (poor blade of woe!) Or a dual-wielder might find great use in an absorb stamina weapon.

Paralyze is never a bad idea.

Needs alot of recharges though...

Dual enchanting absorb health and absorb stamina is pretty awesome for melee weapons. svcks your enemies health and stamina while increasing yours allowing you to go very heavy on the power attacks/shield bashes.