Two things that may be the downfall:
1. Short Shift kit
2. More boost
1. When you shift faster and let go of the clutch (to engage), and if you don't rev match properly (why wait when you have a short shift), the synchros do more work to match flywheel-cluch disc speed....accelerated wear
2. More boost, more power. The transmission, gears, synchros, and clutch can handle a certain amount of power and torque reliably. Exceeding it....accelerated wear.
Someone has to play devil's advocate every now and then