I'm fixing to try these hooks for fishing either 5" or 6" senkos wacky style. What is the adequate size hook to use for this?

I used some 1/0 for 4 inch senkos. So I would go with some 3/0 hooks.

I use 2/0 for ZOOM Finesse worms I would reccomend 3/0 just like tipptruck said.

I use the Wide Gap Finesse Hook Weedless 1/0 & 2/0, I fish them from the head, tail, and wacky. The weedgaurd helps alot when fishing cover. I wish they made 3/0.

3/0-5 in

4/0-6 in

LBH, They don't come in 3/0 or 4/0.  :

I use both 1/0 and 2/0.