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use starter grabs on your tower, just screw two beams to the sides to push off, then make sure to use enough water and i use brown soap, this works so much better then laudry detergent or dishwashersoap, also i dont know your setup, but i had a large down part, short straight part and then a rather high kicker, if that dont work, elevate your straight part, thus making your down part shorter, but also making your jump smalle, i found that you lose less kinetic energy that way, that otherwise gets lost in the bending of your skis over the sharper kinks in your drop-in...
hope you understand what i mean and i hope you get it tuned out!
oh, and before i forget, astroturf has a breakin period, old turf slides better....