Experimenting with different types of coupling caps as well as different types of cathode bypass caps can resolve that.
That problem isn’t necessarily a NFB problem.
What you describe isn’t even a different value thing, but a cap brand thing.
WIMA, xicon, high voltage ceramic, sprague orange drops, etc. can all provide sharper more defined highs. All of the vintage flavors or caps that are reissues tend to have that relaxed high end smear character.
However the latter do one thing the former dont, and that’s add a complex balance of good harmonics to the gain. In my 74 I have a mix of both types. It all comes down to personal preference. I tend to hate amps with all one kind though. I don’t like wizards with all orange drops, and I don’t like old Marshall’s with all original spragues. You need both for an amp to sound good. Where and what value is where it gets challenging.