Here are a couple of reasonable, unbiased ways to pick "qualified conferences".
(1) Just use power conferences:
18-19 = 8-16
19-20 = 12-10
20-21 = 13-11
21-22 = 13-12
22-23 = 12-13 (not editing OSU game)
23-24 = 8-16
Total = 66-78 (45.8%)
Total starting from 2019-20 = 58-62 (48.3%)
(2) Use some way to pick the top X conferences that are not biased why what games you remember losing. You used 8 qualified conferences, so here are the top 8 conferences averaged over the 2018-2024 seasons (not including B10, using Bart ratings. Exact methodology not important, what's import is that it's not based on how Rutgers did against them. You look at that AFTER selecting the conferences):
On second thought the averaging is more annoying than I thought and I don't have time right now, so I'll just provide a separate list of 8 for every season. Assume the other power conferences are included and then add:
18-19: Amer, WCC, MAC
19-20: Amer, WCC, A10
20-21: WCC, Amer, A10
21-22: Amer, MWC, WCC
22-23: MWC, Amer, WCC
23-24: MWC, A10, MVC
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You also shouldn't do things like include "any tournament" if you are going to sort by conference throughout the rest of the data or look at things like "record in the last 3 games of the regular season" and other such nonsense that you were doing earlier in the year. At the sample sizes we're talking about the latter is about as relevant as "record in 9pm starts" or "record on Wednesdays"