If you fly over the arches wouldn't it actually be slower,you miss speed pads + the fact that you have "Coming down" time.

Same situation on Moa Therma forward.
If you nose up and boost at the flatland flyer point and use the airbrakes at the end of your flight you can land on the speed pads just after the first corner.
Problem is it's actually slower due to the "Air time",I've tried it.