Are you referring to items 19 and 20? Without breaking out the photos into an actual schematic, its impossible to accurately analyze unless someone here has done the same mod. But as a general rule you have to understand that any change to the resistances and/or pots in guitar pickup wiring is going to change both the signal level and the tone. The only exception is when the pickup signals are buffered by active electronics, which I'm sure you don't have unless there's a battery hidden in that guitar somewhere. And you also have to realize that the human ear doesn't have the same response at all volume levels, so that even if there were no actual change in tone, it could sound brighter at a lower level.