Thanks for the update.
One point regarding your dislike of setting of miniplug/PIP levels on the touch screen, I agree. But if you set the 'analog in' XLR inputs as 'linked' in the menu, i.e. same input level for L/R channels (using the left side level dial), then the minplug levels can be set with the right hand level dial, not the touch screen. If your XLR mics are reasonably well matched, would it not be ok to set the levels as linked and adjust in post if necessary?