here is what I've done to the Rool pads
normal mode same as your mapper. Then add a modifier to the Slip button and set all normal loops to M1=0
now add these
Loop Size Selector / Direct M1=1 (Desired loop size)
Loop set /hold M1=1
Loop Active On / Hold M1=1
I Only mapped the 6 buttons from 1/8 to 4 because I don't see using 8 or more bars in flux mode.
This way loop works in Flux mode and normal when not