though I think the 60 lap formula excludes us from some combos like ky3 + xfg simply for time reasons... maybe in some cases we should switch to a certain distance or time limit.
I think this goes a bit beyond the "easy" math (whatever that is).
So far as I understand it you need to match the pressures comming from rotaion and displacement of the bearing "comming form the engine". You can either calculate them seperately or use the "direct" way by solving a reynolds differential equation.