The changes weren't as dramatic as the ones i had before, as i basically rearranged things around and changed the wiring from before.
But the most apparent and biggest changes were to the separation and the blackness of the background when nothing is playing. Before this, the soundstage had a nice bump going from stock to the new resistors/caps, with the wiring everything is much more "clearer". And the low end is so much more well defined. When compared to my WA22, it sound like this has a layer of cloudyness removed, whereas the WA22 feels like it has something in front of it. (if this makes any sense)
I had this issue once with one of my desktop motherboards, the only way i could fix it was to first clean the affected area with isopropyl alcohol and then to scrape all the carbon off. Which in turn ruins a lot of traces coming into the affected region, so i had to run wires on both sides of the board. Luckily these amps dont have as many traces as a motherboard, and you seem to have the blue PCB so traces will be easier to spot.
A well lit workbench will go a long way to help you in spotting the affected the traces.