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Edit: after some research I see thatShimano calls it Free Stroke Adjustment. I will have a go at this. Thanks!
Edit2: not possible with grx600 levers.
Hmm, that’s annoying. Only other trick I can think of is take the wheel off, pull the lever slightly (to bring the pads closer together by a fraction of a mm), reinstall the wheel and see if it’s better (or if it was too much and the pads are now rubbing, and you now need to re-centre the calliper or push the pads apart...).
I haven’t read of this being the case, guess it’s possible though.
If you look at the back part of your lever paddles, is there a small bolt up near the top, near the curve of your drops? I can’t remember if grx has one, but if there is then that bolt controls the lever travel: you could adjust it so the brake bite matches your front.