I will just paraphrase Jim Wendler from his 5/3/1 book. Goodmornings aren't on the final(meets).
I'd just recommend heavy enough, but more than 5 reps. I can tell you that when I was doing 531, trying to disregard Wendler didn't help me any. 3x3 on GM's did not help much if at all. With all that said, everyone above has some really good advice it seems. Pick something, try it. It may or may not work.