Yes, you can use any spring you want, as long as the car is tuned for it.
As for "boost creep", I am not sure that it is understood. Boost creep is an uncontrolled increase in boost as the RPM's go up. So if you are starting at say 8psi at 4k RPM, and hitting 12psi by 7k RPM, then it is considered boost creep.
I have not had any customer experience boost creep, this includes the local guys, where I installed the same kit you guys are running.
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