A good tuck and a steady head is all you need. Yes, a responsive board allows you to pump easier, but with good technique you can do it with any board. If you're tuck is good, you will go faster. Having the head to keep that speed up is the other component. If you have a good enough head you can run any hill with your trucks almost falling off. Speed wobble is not in the board, it's in your head, it's just that with a looser/flexier board your head gets sketched out quicker.
If you'd like to come race, I'm more than welcome
