Actually, mamemo, try this.
Dial in a bit of drive with your TS7 and get your TS7 to be on unity gain (equal volume) on CLEAN. So when you switch it on, your clean channel will have a bit of TS7 dirt but the volume is roughly the same.
Now, take your main distortion, whatever it is, and lower the gain by a few notches.
Run your guitar to ts7 to main dist to amp.
Adjust your ts7's gain level to taste, make sure you maintain the volume level as unity gain.
Now you have 2 gain stages, plus its likely you have less noise.