I figured out an easy and a semi-consistent way to line up the bunnyhops at the slope: instead of taking the shortest path (basically hugging left wall), you can swerve a bit to the right and make it so the first jump near the slope is just after the slope starts, and afterwards 4 jumps with the last one being at the top of the slope (or even a bit after, which is good because you won't have to have as much speed to cross the gap(s)). There's also the possibility of figuring out a setup that hugs the left wall, so you don't waste time on swerving to the right.

I still think the demolition discs, if used very well, can grant you ludicrous speed that can help squeeze out a bit of time but I want to see this strat pushed to it's limit as it's not very demanding on mouse movements (which I'm not confident in)