There are 2 fundamentals here:
1) You cannot E.Q. for live through a guitar cab. The sound is so vastly different to what you send FOH that you have to build your sounds using some kind of FRFR speaker first IMO.
2) Every PA sounds different. Unless you E.Q. yourself at every gig, then you have to accept variation.
Personally I don;t use HPF/LPF at all, nor do I E.Q. at any gig, I treat it like a regular amp and let the sound engineer make any changes to their PA. If the PA is crap, then everything will sound crap, not just your guitar and the sound engineer will know their PA the best.
The only change I made is at the last gig, the sound engineer said my rhythm sound was a bit fizzy and wished it sounded like my lead sound. Turns out that when copying a sound across I'd missed some settings, so now resolved.