It's not so much sinking that will be the problem as the fact that you may lift it, thus destroying the turf's attempt at rooting. I'd agree, you need to leave it to settle in and begin to grow vigorously before you go disturbing it. At least a good couple of weeks, if not longer. Personally, I'd prefer it to gain at least a couple of inches, then only top it off lightly by at the most a third.