Multichannel Track (how to achieve?)

Hi everybody,
I have a Guitar Setup with three Channels:
Ch1 - Acoustic Guitar Piezo PU
Ch2 - Mag Pickup to Left Amp
Ch3 - Mag Pickup to Right Amp
This is all coming from only one Guitar (with a Piezo and a Mag Pickup installed).
I use this setup for Hybrid Sounds: E-Guitar sounds (Mag Pickup Output through several Stereo Pedals into two Amps) but also a Dry "normal" sounding Acoustic Guitar in the Middle (Piezo Pickup to Acoustic Amp).
Sometimes i make loops with the Acoustic Sound, sometimes with the Stereo Sound and sometimes with all three together.
What would be the best way to setup a Multichannel Track in Mobius? I tried Grouping two Tracks and setting Group Tracks have Focus Lock, but it seems this setting isn't remembered, so it loses it all the time (is it a bug?).
Also when overdubbing, a problem occurs that Mobius doesn't create the same amount of Layers in each of the grouped Tracks, so when undoing, things get messy.
Is there a better way to set up Mobius for this?
Thanks a lot for your suggestions!