Wow, I totally just typed a reply and it didn't post! Here it goes again! The main clutch spring can limit your top speed if your rollers are too light to overcome the resistance in the clutch pulleys. The loss of speed may have also been caused by the restricted cdi which was not allowing the engine to spin the variator fast enough to close the variator. You may want to try the "1000" main spring again with the cut cdi. If you still have a loss of speed you need to go with heavier rollers. The small clutch spring will also make a big difference in take off acceleration! CVT tuning can be an art form! It takes everything working in perfect harmony to get a screaming scoot!