I've been using the TM60 for close to 15 years, I have two and a Power Engine as well. Every couple of years I start thinking about a speaker swap. Any of you guys have this amp and are happy with a different speaker?

Hi all, new member here. I have recently bought an Orange CR120 head. I'm playing it through the Orange 1 x 12 cab using an Eminence Swap Thang speaker. I like this amp a lot, but there is a "fizz" that seems to go along with the gain. I do not use a tone of gain, I like classic rock/blues stuff. If you are familiar with this amp it supposedly has a cascading gain control. In any case I am using and GE-7 EQ in the loop and having some success but I'm wondering if there are any types of mods that can be done to reduce or eliminate this fizz?