If you want to sound natural, don't use high cuts... just tweak your amp's middle, treble, and presence settings like you would on a real amp. We don't have a high cut control when using real amps and cabs, and probably don't ask the sound guy to cut highs in our monitor... we simply turn the knobs to get the response we want. Tweak the amp for what you're hearing instead of compensating for bright amp settings by chopping off the mic'd cab's natural frequency information.Thanks for the reply!
I'm really surprised about your suggestion of not cutting high end (that for sure will try at next reherashal), as I see in a lot of threads about frfr that everybody is applying heavy cuts, down to like 5k or even lower to smooth the harshness of frfr vs real cabs. Does it apply mainly to recording/going through PA and not to band rehearsal situations where the frfr monitor is your main sound amp?
Sample of it being discussed here: https://forum.fractalaudio.com/threads/low-and-high-cut-for-live-performance.200541/
If you turn your middle, treble, and presence knobs to zero, your tone will be unusably dark. So any piercing highs are coming from the amp's settings or a monitor that isn't actually "flat" that's enhancing harsh frequencies.
I toured and did session work for over 25 years and never had anyone put a high cut on my guitar. When I started using an Axe-Fx and cut the highs (like everyone told me to do), my FOH guy always had to boost a ton of top end to make my guitar sit well with the tube amp guys on stage. When I took the high cut off, he didn't touch the EQ on my channel and my guitar sounded fantastic in the mix. Players and FOH guys from other bands were always coming up to me and asking about my rig because it always sounded massive through the PA.
You can also try a darker mic placement like a "CN" or "OA" capture. In any case, amp settings aren't welded into place. So twist some knobs like the real thing and you'll get great results... as long as your monitoring source is accurate.