The problem with grades pt. 2 (V7 vs V8 tested)

I tried 30 more board boulders (15 V7s, 15 V8s) to continue testing the reliability of grades and answer 3 new questions: Would trying 5 more V7s per board change the results from my last experiment? Would the board rankings stay the same at V8 (TB2 being the hardest)? And finally, is V8 actually harder than V7 on each board? The results were surprising, even for me! Link to Kimbrough Moore's datasets on gender in climbing (thanks for collecting these!): https://drive.google.com/drive/folder...