Afteri experimented with soap and water wet it like every 3 runs and i use green soap that comes in buckets of 5l
i still found i needed more speed so i did following things:1) i simply raised my tower, i put it on top of a dirtpile, now its about 2ft higher and its anchored in the dirt2) i mellowed every transition, my whole running length got longer but it works better + you feel more secure...3) the steeper the drop-in the more speed you gain, soft drop-ins lose much energy to friction, problem with steep drops is that you have to get a fine transition otherwise it wont work....4) not really making the turf faster, but the rails, my hdpe needed some sanding , it was getting too beat up... eventually i turned it over and it works better, so keep your sliding surface smooth...5) pretty much the same thing for turf, keep it smooth, allways run over it in the same direction, go with the hairs/grass, not against it (yes, old turf is usually faster, unless ofcourse its really beat-up)6) i apply soap with a broom, i rub it in, creating lots of foam, this slides the best+ i brush in the same direction as i ski...7) i made starting handles to push off (this works good, especially if you don't use poles8) jump-in instead of drop-in, every height you gain is translated into more speed...9) my latest addition: orange snowfence on top of my turf, works great, this should be the first thing you change, it works so much better!10) I POSTED MY QUESTIONS IN BUILD A JIB 101