Reaver: If you go flying off it's generally because the game is playing back some movement that's not you 'humping the wall'. Basically you just need to be more patient before rewinding, just overdo it for a while (+20 seconds) and then you'll get a feel for it eventually. Also, spamming forward really hard makes the individual movements smaller, which also increases control. Another thing that can help is rewinding slowly after 50% of the rewind is done.
UCPro: You'd have to do the palace defense puzzle for the enemies to spawn, pulling the switch isn't enough. The thing is that for any optimized segment you could make with extra saves, I could make a sloppy one that was faster because it didn't save (I think). The only viable one before Cliffs is Zoo, and the optimal route would have you skip spawning the hammerbros. That's still a long segment.
UCPro: You'd have to do the palace defense puzzle for the enemies to spawn, pulling the switch isn't enough. The thing is that for any optimized segment you could make with extra saves, I could make a sloppy one that was faster because it didn't save (I think). The only viable one before Cliffs is Zoo, and the optimal route would have you skip spawning the hammerbros. That's still a long segment.