I mainly use Keitech Swing Impact Fat swim baits for 2.8" , 3.3" & 3.8" swim bait lengths . For these sizes it would appear the Owner Flashy Swimmer  1/0 - 1/8th oz. and the 3/0 - 3/16th oz. should be the ones to reach for  ...  Your thoughts and experiences ?

I use the 1/0 with 4" easy shiners and the 3/0 with 3.8" swim impact fats if that helps at all. Also use the 5/0 but I like a skinny dipper with that one...suppose you could go with a similarly sized keitech but the skinny dipper is an awesome bait to throw on a 5/0 flashy swimmer...

I’m inclined to agree. In my experience the 1/0-1/8oz fits best with 3.3 and the 3/0-3/16 with 3.8 or similar sized paddle tails.  
 

The 3/0-3/16 IMO fits best on the Zoom Fluke (5in).

From Keitechs page:

• 2.8" - 1/0
• 3.3" - 1/0
• 3.8" - 2/0
• 4.3" - 3/0
• 4.8" - 3/0 or 4/0 
• 5.8" - 6/0
• 6.8" - 8/0
• 7.8" - 10/0 or 12/0

 

I use the same sizes as you but much prefer the Duo Realis Spin Hook. The weight has a smaller profile and it comes in sizes 1/0, 2/0 and 3/0 and in weights from .9g (1/32) to 10g (3/8th). I do change the twist lock to a larger size, however.

1 hour ago, Brian11719 said:

I use the 1/0 with 4" easy shiners and the 3/0 with 3.8" swim impact fats if that helps at all. Also use the 5/0 but I like a skinny dipper with that one...suppose you could go with a similarly sized keitech but the skinny dipper is an awesome bait to throw on a 5/0 flashy swimmer...

Man's over here casually describing the only three swimbaits i usually throw. Nailed it

Here's a 2.8" and a 3.3" Fat Impact on the Duo Realis Spin Hook.

 

Also three, 3.5" OSP Dolive Shad on same hook.

I use them a lot but only on a bare jig head.  Do you guys do better with a blade vs no blade.  If so what about a Pony head with a willow blade?  Just thinking.

On 10/4/2024 at 7:44 PM, RRocket said:

From Keitechs page

This video actually does a pretty good job of sizing them out:

 

TLDR I'd strongly recommend a 3/0 for the 3.8 size.