The "ITU Input Ref[erence] Level" setting scales all of the thresholds in the downward expander (and also adjusts the input reference "line" on the input meters). If you already have it all the way up at -20dB LKFS, the only option then is to turn down the input levels into Breakaway.
The presets are generally adjusted for -20dB LKFS setting, but in the new versions of Breakaway it will be 0LU which is basically -23dB LKFS. I’ll be sure to recommend that the setting be able to go higher, as I’ve wanted that myself a few times.