Through the return jack on my 1987x sounds outstanding,cab sims off...
Cab sims off? By that do you mean amps and cabs bypassed in the chain or is there a setting on the Axe-Fx interface to turn off cab. sims?
My chain is pretty simple when I use my amp.; GCX Buffer -> Compression -> [Axe-Fx (EQ -> Reverb -> FXLoop-Output 2)] -> pre-amp -> AC30.
I know this was already answered, but I can't remember..
Which of the new IIC+ models matches the old one (before G3)?
What IR did you use?