Glad to hear you got the effects loop setup working. If you wanted to experiment with 1 up front and one in the loop, I’d connect from the last pedal in your “front” chain into H9-1’s Input 1; then, Output 1 to the front of the amp. The second H9, just leave it connected to your loop as it is currently, using Input 1 (Send) and Output 1 (Return).
Again, make use of the Mix parameter for each H9 to optimize the balance of dry signal and affected tone.
