there is no do never highpass higher than "insert frequency here"
It all depends on the source an here is a massive load of hum in the bass guitar tone. sth around/below 60Hz. when you highpass at 80Hz for example you have -3db at 80Hz and -12 per decade. So it isnt "cut out" but very reduced. And your low shelf with -3b would do the same here. I bet there will be enough bass left over when you turn its volume up again after that hp, so it works in the mix.
the Highpass at 50Hz just halves the volume at 50Hz, what could be/is to little in this case. The lower frequnecies get highpassed on a normal stereo system anyway.
And normally you place the kick somewhere between 60 and 90Hz. And the bass above. not beneath at 50Hz... So a highpass at 80Hz isnt that critical.