Firstly don’t use the compressor on the ABM600 as it drops your volume and sucks tone.
I now use the MXR 87 and it works brilliantly with the ABM600 head.
I set mine as MXR suggest and raise the MXR output so I just hit the VU meter Red on my loudest notes.
The result is a louder amp, more definition and thump and no large peaks to worry the speakers