Sorry to go off topic some but this is not 1995 anymore. The whole low compression for boost is a little out dated and is also more for large motors (v8's). With the tuning capabilities today you can be safe with the higher compression. I know that by the "book" you should do low compression with higher boost but I also know from "EXPERIENCE" and an engineering degree that higher compression and higher boost is very doable. The higher compression will have more thermal energy and in turn spool turbo quicker for better day to day driving. Also, you will need less boost to make the horsepower that is desired. Have to remember that motors normally blow up based on horsepower produced rather then how much boost.

Example for this thread. Using same turbo and accompaning parts.
9:1 compression motor on basic t3/t4 turbo will take about 20-22 psi to make 300whp
10.5:1 compression motor with same turbo will take about 17-18 psi and spool quicker and be at full power (due to lower boost) even quicker.

Examples of other motors I have done in the past few monthes
B18c1 10.2:1 comp 6262 billet turbo 19psi 565whp PUMP GAS
H22a 10.5:1 comp GT3076R stock head and cams 19psi 476whp Pump gas