There's not a direct LUFS control, but yes there are various ways to reduce the level a single dB. If using the advanced clipper, lower the drive 1dB by reducing the Quick-Adjust Loudness on the main processing page. Or you can go directly to the Advanced Clipper page and reduce the clipper drive, or enable the Limiter mode and attenuate it 1dB in the Limiter's settings. This is better than using the post-amp, as it creates more headroom rather than simply reducing the output gain.
edit: bleh I misread. Pretend I said increase instead of reduce.