I can't seem to find a screw in underbelly hook for the 3.8 kietech I found this Owner Weighted Beast Hook w/ Twistlock but I would think a 6/0 would be to big?

TW has Eagle Claw twistlock swimbait hooks...1/4oz with a 3/0 hook, which is the right size for that 3.8 Kietech.

https://www.tacklewarehouse.com/Eagle_Claw_Lazer_Sharp_Weighted_60_Degree_SwmbtHook_3pk/descpage-ECSWBHK.html

Or get a Flashy Swimmer or Duo Realis SpinHook if you need more flash.

 

And MN Fisher is correct....3/0 fits perfectly.

Owner beast 6/0 is too big.  the back of the hook would be in the tail.  Its also a beast of a hook (no pun intended).

 

The Owner twistlock lite in 5/0 has enough gape and not too much length.  The 4/0 isn't enough and the 6/0 is too much.  They come weighted and unweighted. The Lazer Trokar swim blade in (I think) 5/0 fits.  I have the hooks here and they fit.  Pretty sure its the 5/0.  

Gamakatsu Weighted Superline Spring Lock Hook 4pk | Tackle Warehouse

 

4/0- 1/16oz top bait.

4/0-1/8 bottom bait

 

It's a heavier wire gauge hook, so the 1/8 oz version is slightly heavier than an Owner Twistlock Light 3/16oz weighted hook.

 

https://leadfreebassjigs.com/products/weighted-swimbait-hooks-5-pack

 

I use the 4/0 and 5/0 for Rage rigs, but he has 3/0-5/0 in 1/8-1/4 oz