There may be a technique issue if you can rep 75kg for 5 and not get anywhere near 87kg.Think I'm going to go with a 5/3/1 routine - simple but something a bit different to 5x5.
I've downloaded a couple of apps to have a look to track the weights and one thing I've noticed isn't adding up (literally) it seems to think if I can do a 75kg benchpress for 5 reps then the max should be 87kg... well that certainly isn't the case! I can't get anywhere near 87. Should I ignore this and go with a lower 1 rep max?
But also, I wouldn't pay too much attention to those 1rm predictors.
Basically yes, but only as a very rough guide. Training age and history play a huge part too.For reference, when in your mind does someone become not a beginner? I know it will vary by person but something like a 1.5xBW bench, 2xBW squat and 2.5xBW DL?