Sticky, i have always been able to get about 20 reps on 70%, but i have always preffered reps rather than heavier weights.
Bench 130kg, 20 on 90kg (roughly 70%).
Last year did 16 strict reps on 100kg bench, got 137.5kg for single.
70% of 137.5kg is 95kg, would have gone close to 20 reps for sure given 16 on 100kg.
As i mention, really depends on how you train. i have always been good on reps.
Fred Hatfield says it means you have slow twitch fibres. Maybe he is right but did read Arcidi doing 20 reps on 495 pounds not long away from his 700 pound bench (70%).
Your 20 reps on 150kg powerlifting squat is pretty good (no wraps i take from video).
Again, does not matter for stenght sports, matters more what you get for low reps (6 and less).
I normally know what form i am in from 10 on 80%, 20 on 70%, and 4 on 90%, but for me i find some correlation (for myself only).
when i did 120kg for single bench first time (early 1980s), I could get 35 reps on 70kg (about 60%).
Could also be I am not well trained at low reps, since i rarely do them. Just dont like training with heavy weights and long rests. Bores me to death.