High all, I’ve got the 2.8” Keitech’s for my 1/8-3/16 Underspins. 
 

I am now looking to purchase some Picasso Weedless Swimbait heads for 3.8” Keitechs. What weight and size hook would be best for this size?

 

Thanks much
 

 

It depends on how deep you will fish them.  I use 3/0 and 4/0 hooks with 1/4 oz heads for that size bait unless going out to 30’ or so.

The short easy answer Is a 1/4 oz is a good starting point.
 

However depending on the depth, there are a bunch of factors.   what is your bottom composition.  If your bottom is a hard bottom or sand you can go as heavy as you want or need.  If it’s really weedy or snagy you will have to play around with it.  Ideally you want it as close to the bottom with out getting hung up constantly.