RME Totalmix loopback delay between DAWs

[nicolasvr]

Hi

i'm routing PT11 to Ableton 10 through the virtual cables loopback-system Totalmix offers with the MADIface Pro i own, and back into PT to print the efx used in Live. This is my setup:

In PT:
External FX 1 send -> MADI 1/2

In TotalMIX:
MADI 1/2 (software playback)-> MADI 1/2 hardware output (loopback)

In Live:
MADI 1/2 (hardware input) -> Live efx chain -> MADI 3/4

In TotalMIX:
MADI 3/4 (software playback) -> MADI 3/4 hardware output (loopback)

In PT:
MADI 3/4 (hardware input) -> External FX 1 return


Problem is that i'm getting a 0.5sec delay between the source track in PT and it's processed return..
Anyone could help a hand with this?