The engagement of the 102C is higher than the stock clutch. Also, it allows the engine to rev up higher before it shifts. This allows the engine to make more power. This may be what you are saying is not shifting. However, if the driven clutch is not moving freely, it would hinder up shifting and down shifting which might cause both issues you are describing. If the engine does not return to idle right away if you free rev it, then you are lean. You could have an air leak.