I´ve also tested the Doubletracker. Basically it comes very close to the Mimiq, but I also have this "pulsating" sound (the right side gets quieter from time to time).
I also noticed that when you change rigs there is a strong pulsation, as if you were playing over a leslie-box for a few seconds. I copied the default crunch rig and switched it back and forth. The DTRK was in default mode (looseness 5.0, stereo 100%, detune 0.0 cent).
That could be the phasing issue that happens with DT's and it can happen when strumming harder. Try using a compressor, or add the Chromatic Delay Double Tracker preset with the right side at 13ms or less (the side that gets quieter) and 0ms on the left side., or try a very light Chorus instead around 1.4.
In DAW, you would just invert the wave signal on the left or right track.