The turbo you've got is more efficient at higher boost though, isn't it?
Knock 10-14 is acceptable. >30, jump off the go pedal.
Basically the best idea is to have the boost set to what is safe for your engine, then tune to suit, and then use your right foot to control how much boost you use.
For example, if you tune your car for 14psi, and then drop max boost to 7psi, all that means is when you've got your foot flat and you're reving out, your injector duty cycle at any given RPM will be the same as if there was more air being pushed through. Which means you'll be running rich. If that makes sense.