No solution gets this right. Change the rule to 15 and they still get it wrong, just cost less yards. Even if it becomes a sky judge ruling those guys can get it wrong less but how do you determine when you review? On any given play there can be some bumping etc. Do they review every receiver on every pass play? Or review only the plays called then it does not help for no calls like on Diggs.
When I get pissed at refs like this week I want them to just get rid of PI altogether. Just let it be a free for all so at least the refs cant impact the outcome. Will change the game quite a bit obviously. You will need big physical WR's and TE's or run plays to create space.