honestly, i wouldnt bother heel+ toe in anything less then 160 hp/ ft.-lb. and especially if your not on a wonderfully winding road like the ones back around Hell, MI... and many other places ive been/and not been.
and in responce to what you appear to be doing to the clutch is burning it. it works both ways where it can be burned where to much throttle is applied between shifts, and the synchro is hurt, and the clutch plate is frying. think of it this way, you are applying much more accelleration to the engine/trans when braking then you could hope to when full throttle is engaged, and whithout bliping the trottle to match rpms, more severe damage could occur then if you were power shifting all out...
i may be wrong, but there are some sound techniques here
good luck
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