Wouldn't redrilling change how the truck feels while turning in manual?
Especially since I'd definitely only drill one using a 6 hole plate then the 69 method.
Are you referring to the way Koston and others do this with their Venture trucks?
If so, then yes.
Completely.
I think the easiest way to explain how it felt is like this - it is like going from having a brick on the front of your board with normal Ventures, which give it the heavy lift feeling when compared to other truck brands, especially Indy or Ace, to having zero weight on the front of the board at all, so it is almost too light compared to everything else, so completely opposite extremes with the difference in where the truck sits on the average board with average wheelbase and holes drilled with normal fingers of flat.
Not that hard to get used to if you stuck with it and skated those same trucks on the same longer wheelbase board, but I guess for those people who do drill their Venture baseplates in the alternate hole pattern, each truck being now 3/8" less so a total of 3/4" for both trucks, that is some serious difference you feel on any board, taking even a 14.75" wb down to even 14" if you wanted to.
I only tried it on an 8.38 with steep kicks and 14.5 wb which was a board I would not have skated normally on my Indy 149 trucks, and it worked really well on Venture 5.8s in the short wheelbase option. To note the normal wheelbase option on the Venture trucks was terrible for me, but that was just one example and as said, I come from riding Indy trucks normally.
What I would recommend before drilling out the trucks is drilling in the wheelbase on an old board first, just to feel it out. That is a whole lot easier and gives you a chance to get a feel for it, without maybe making a mess of the baseplates, or realising that it just doesn't work for you.
I did just the tail end initially which made it much more normal all round, as someone else had done to make it more even in the kicks too, but doing both is worth it, just to experience it even once.