Your not alone, I often have my HPF set between 80 and 100 for bass. There are no set rules here, just general guidelines.
Remember, if your kick is taking up the space below 80 there is no room for bass so it should be rolled off. Others will roll off the kick at 80 then let the bass fill that space instead. To really get a clean bottom end - you should be notching those two - at the others dominant frequencies. EG: If the kick has a dominant spike at 100hz, notch the bass at 100hz to make room for it. If the bass is dominant from 60 - 80, notch the kick in that area to create room. etc... etc... etc...
Also - just because the low E on a Bass is 41hz, that does not mean you need the bass in that area. That low E will be emphasized with any frequency that is a multiple of 40. EG: 80, 160, 320, etc... Think of it this way - the low E on a guitar is 82hz. Unless I am recording a solo guitar piece, I won't let the guitar anywhere near this space. I start to work it 1 - 2 octaves higher on an EQ.
Just my 2 cents...