although I can only suggest what could be going on as I only have 25 passes on my combo ,the one thing I can tell you is if you get a data logger you can see what is happening during the run ,,,when you make changes to the clutch you will be able to see it on the graph and compare several runs together,,,i have a rpm data logger 10 channel with the basic engine rpm,drive shaft rpm ... it also gives you a R.A.T number witch is the slippage between the engine and input shaft ,with that system you can add other sensors,o2's, it takes the guess work out of runs that went bad(loosing traction down track,bad starting line or slipping the clutch) its not priced bad and its made in America and they always will return the phone call if you have a question, I have learned a lot and still learning gmonde
http://rpmperf.com/