On the spring tester, coil bind the springs a few times. This will typically drop the pressure just a bit so you have an idea what you'll be working with after it has run for awhile.
I like to run about .120" away from coil bind with new springs. This way on a freshen up you can stuff up to .060" shims in there and still be ok. Running far from the springs coil bind isn't necessarily bad, but it tells me that it's the wrong spring for the job if it's over .120" away.