unwanted interaction between channel 1 and 2

[Bieworm]

Another question...

On my imperial clone buil I wasn't happy with the way the OD channel sounded so I changed that part of the circuit.
Apparently , due to the design, the clean channel and the OD channel seem to interact. I noticed that when I turn down the gain knob ( A1M voltage divider ) the clean channel looses clarity. I think that because of the shared 1st triode there is some signal bleeding down via the voltage divider to ground.
I drew a resistor (blue) to try blocking the signal going in that direction. Is this a good approach? I haven't tried it yet, but I'd like to know what you guys think. Or is there another way to avoid too much interaction? Adding a relay between the plate load resistor and either circuit is an option, but that would be the least of my favorite options...