In update to my last post I've skated the 53mm V5 X99 on a variety of terrain lately but not insane crust. Most asphalt some of it rough getting to/from spots, concrete sidewalks/ground mostly decent, and my local skatepark, which is not too slippery.
Compared to a 53 F4 99 Radial these are a bit faster when the asphalt is rough, but it is really close. On cement I do not notice a speed difference and at my skatepark they aren't really much slower. Maybe take a firmer push or something? I don't carve bowls and mostly skate the ledges/boxes, small QP, and lately a flatbar. My main gripe with the Dragon and 97 was the drag on grinds, which still does exist but wayyyyy less. If the ledge is decently waxed it is not noticeable for me. When the park coping or a painted curb were dry I did get a squeal sound and rapid drag. I waxed those same things up and didn't have an issue. It is less of an issue than the Dragons or 97, but not so much that I would switch from one of those to these hoping it would disappear as those are simply faster on asphalt and anything remotely rough.
My main gripe, which is strange considering the Dragon and 97 is that these powerslide/revert worse for me, which is baffling since they're harder. This makes them a bit less fun to skate flatground on or at the park, but its not a deal breaker and I don't notice.
Overall I will likely go back to my F4 Radials for now. They are just as fast more or less on the roughest ground I skate and slide a bit better on the sides of ledges. They have a much wider contact patch than the V5 and I imagine that's why they feel close speed wise. A similar contact patch F4 99 would not be close to the X99 I can say that for sure. When I did have sticking I was on Indys and I compared with a friend's board on Thunders/F4 and his slid faster. I normally ride Thunders so with even less plate I'd have to worry about sticking on some of the drier places I skate. Not a huge issue if I can wax the side of the ledge, but personally I don't like being the one to have to wax shit up and "going even faster" just got me bucked on this same dry ledge with a nice celebratory squeal.