I've been testing a set up using 280 ramps for 500 ft grass drags.. I have the highest preload spring I can find with a small notch in the ramps and can only get a 5000 rpm engagement. I'm a bit nervous about grinding deeper notches into these weights as I have no experience with this.. Does anyone have any pics of weights they have done? Could I cut custom ramps with a small lip coming out of the notch to add further rpm's??? Any advice would be appreciated.