I can't help on the tweaking side of things, as I'm hopeless (which is why I buy fremen's packs etc)
However, Just to clarify, did you press the "save preset" button after amp reset. I use the "revert preset" button a lot when messing about with any parameters and as long as you don't hit the save button, I can mess about to my hearts content and still keep the original intact.
If you did actually save a poorer sounding preset, are you able just load up the FW7.02 version again from his original file?
FWIW, I tried a few amp resets on fremen's pack and all sounded worse to my ears.so I just left them as they were. Whiich sound totally awesome.