Yeah – those standards I outlined are somewhat arbitrary, and based on personal experience as well. You’re right, the OHP is probably the toughest of those for most – but for many athletic efforts (from lifting, to throwing, etc) is – in my opinion a better strength indicator than BP.
At 200lb – my lifts are:
335 or 345×2 squat
200×2 strict form Overhead press from standing – locked leg, minimum back arch. (I prefer this form vs. seated as it hits stabilizing muscles better)
495×2 Dead Lift
I do have a couple reference points that I used, however:
https://www.crossfit.com/cf-journal/WLSTANDARDS.pdf (I think this is based on research by Rippetoe and Kilgore – Starting Strength)