Tried some 8 inch ventures coming from 8.5 ventures on my 8.25 board. Was hoping that they'd help with flip tricks but the difference isn't very noticeable.
Maybe helps a little bit with some flip tricks if we're really splitting hairs, but honestly it messed with a few of them too because I like to lean my trucks for things like backside flips, switch heels etc and the smaller trucks got wheelbite or made me fall off easier than on a wider truck.
It did turn noticeably sharper though so that was quite nice, but was kinda countered by the fact that I had to run them a bit tighter to make them feel more stable. I think I can see why some people say it helps with flatground, but personally the marginal benefit wasn't worth the reduction in stability and grinding space, which was very noticeable on chunkier ledges and round rails.
Maybe 8.25 trucks could be a good middle ground, but if its between 8 and 8.5 on an 8.25 deck, I'd much rather stick with 8.5 for now.