Hey amp gurus! I have recently done the negative feedback mod by splicing the blue NFB wire and putting a 500k pot between it to use as a variable resistor. I used an audio pot I had laying around but plan on getting a linear pot so the taper is smoother. One thing I noticed is when I have the pot all the way to the left it is stock and the farther to the right I have the more resistance and it gets beefier. But the last say 10% of turning the pot wide open I notice a large volume drop. Is that normal?