Magicdealer
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I'd think it would be item specific.
For raining arrow, it says " hitting the target and splashing nearby creatures as if you had thrown the vial"
So I would say from that you only deal damage as though you had thrown the vial. No arrow damage. However, you get the much better arrow range increments.
Slowburn says "On your turn, 1 round after impact, the burst of flame deals 1d6 points of fire damage to the target"
So normal arrow damage if you hit. Then, 1 round after that damage, you deal the 1d6 fire.
Trip arrow says "If the arrow hits, it makes a trip attack "
A trip attack doesn't deal damage, it's in place of an attack. So I'd say you forego the damage in place of the trip attack.