..with the 8.5s and the stock spring, i too experienced slippage..the first mile or so was awesome, then performance dropped off...
..couldn't get any torque...so i changed to 9 gram rollers and the 1000 torque spring...
..take-off suffers a bit... i don't have that super-quick take-off like before..
..but remember, i'm still kinda babying it, as i still have the split reed...
..before, with the 9 gram and 1000 spring, everything felt good...
.i'm going to stay with this setup until my reeds arrive, as it kinda keeps the engine's rpms down....