Keitech recommend 3/0 hooks for the 4.3 fat swing impact. I bought 3/0 VMC weighted swimbait hooks, but they were way too small. What brand/hook size works for you? 

The size of hook is less important than how big the Gap is, distance from shank to point. I use Owner Beast hooks nowadays because of the good sized gap.

 

Those VMCs have small gaps from what I can remember.

pretty sure I use the 4/0 vmc for that size and the 3 for 3.8. Doesn't have a really wide gap but I've had good luck with em 

I ended up with 4/0 Gammie EWG in that bait and rig it Texas rigged with 3/16 slip sinker.

6th Sense Divine 4/0 is good. 

 

A 4/0 dirty jigs matt allen head. 

 

Gamakatsu also makes a swimbait head with a skinnier head profile in various sizes. 

 

I'd like the screw lock best for preserving baits, but the matt allen head looks best and runs even, but baits don't last as long on the keeper IMO. 

I can't speak to 'best' size, but with a 4.3" Keitech Fat Swing,

I use a 4/0 Gamakatsu weighted spring-lock hook.

 

Roger