Why restrict yourself to sub-venom ? It really works for about any zone, you may just want to get off the track slightly earlier as you progress in speed. I'm still looking for a way to br without hitting the walls (and missing SP if possible) on the open section of Sol 2 rev without boost around the 40s-50s. I managed one, but I didn't manage to replicate it, getting the right pitch as you exit the track is really hard imo.