I do the same thing, except externally. I have a stereo AUX set up for recording. I send the channel to be recorded to the AUX (all the way up, or +10), then in the RECORD Aux I have the compressor set at 4:1, and boost the output level of the compressor +18db. I then take that processed signal and boost it another 10db out to my recorders. Yeah it’s complicated.
So to summarize, set up a RECORD AUX, then boost everything in the AUX and send that to the USB Record channels.
If you need more info, let me know. I won’t be back to the board until Sunday, But I can take pictures if need be. Hope this helps.