Truetrac and shot are not words you often hear in the same sentence. Nothing wrong with either brand but you won't have to worry about breaking them unless you're a complete monster. Mines got a crap tonne of high torque horseplay kms, doesn't skip a beat or make any noise. It's the driveshafts that hate it
Shaving the heads will get your comp ratio up, which for n/a is a great way to make more power by squashing the AF more. You do the exact opposite for boost. I would suggest if you do shave, you port as well. Gives the tuner more to work with
Honestly, low down torque is how you have fun on the street. Big rewards, minimal attention. I'm making 240rwkw/400nm @ 60kmh in 4th on WOT. Little squirts = big smiles