I'm not saying a bigger skimmer won't skim, but it won't be as efficient. I'll use my MRC 3 dual beckett skimmer as a good example....That skimmer is way overrated for this size tank and wouldn't be efficient, because it would pull, but the efficiency of the skimmer is poor.....And again you might not get the skimmer to perform consistently as well.
I don't have a specific thread, I can send you to, but that has been a long ongoing discussion from time to time over on the other big forum about over sized skimmers.....Plus the electrical consumption of a bigger pump or more pumps, and you see no added gain.