Well, just to be clear, I DID see an improvement when I first switched from lvl 2 to lvl 3.
I don't remember exactly now, it was too long ago, but it was enough to convince me to improve to lvl 4 later.
Your experience with gate receipts actually improving after firing your PR is really baffling, but I will take it into account.
Maybe the effect of a higher skill PR is more evident when you're really far from a sellout? Or maybe it's the other way around?