no not really, apply the same logic that created the speaker impulses to you micing technique. My impulses are mic and speaker only no extra EQ. So purely the speaker and the mic combined with the position.
But also mic live and I don't have an issue with harsh guitar.
I EQ out anything I consider harsh on my equipment.
The info I gave you in relation to frequencies and harsh zones is still relevant so it's not different to your case unless you recording using some kind of space age technique?
What exactly is the issue you are having? To fizzy?
Here is a tip, record some guitar that you think is harsh, then bring it into your DAW, then on a parametric EQ pick a frequency, use a Q of about one, increase the gain on this frequency by say 5-6 dbs or whatever you want without deafening yourself, and then move it about different areas until you find sounds that when boosted are increasing the harsh range. When you find one, or may be 2-3 areas you know where to make the cuts. These cuts can then be made on your live gear. You have a fancy EQ so you can make the cuts or boosts on that.
It's called EQ fishing, google this unless you are already familiar
Another method can be using two mics and phase cancelation to get rid of shitty brittle frequencies.
see this link
https://www.youtube.com/watch?v=yh_2m31dPlEthis all depends on what the "harshness" is that you are experiencing.