Interesting thing I am finding so far - cutting the preamp out mod. Allegedly people gain such traits as more details, clarity, etc. Because my darkvoice comes from bizzaro world, its the opposite. What I ended up gaining is alot more bass. Bass range suddenly elevated. I mean everything is super punchy, and strong and bassy. As a result, I've lost some of those details and clarity. Adjustments to my dac (going to NOS/Sharp Filter or OS Slow or Sharp) kind of boosted back those details and clarity. So all in all, it's an interesting result for me with a single wire cut.
Oh and heed the warnings well with draining the capacitors. My oversight on this resulted in me melting one of the caps i was trying to solder in place. Fortunately, the amp still works, and it doesnt look any worse for the wear, but it quickly ended my attempt the fitz mod. Lol. Good times.