Part of the poor tracking is down to where on the neck this line is played. It’s on Eb at the 11th fret of the E string. I’m using really heavy flats with a medium action. What I’m finding is that those things are causing the string to play a harmonic if muting with only my LH index finger. I’m other words, it’s partly a technique issue. I found that using more LH fingers and my RH thumb to mute the E string when skipping octaves improved things a lot. It’s pretty tricky to keep moving my thumb back and forth at speed. When playing octaves on E and D strings without effects, I generally anchor my thumb on the pickup and it’s fine. It’s going to take some concerted practice to adapt.