Hi Malte,
Sure, depends which side you want to adjust of course, I am merely indicating a possible technique.
Michiel, speaking as a player myself, your example score seems fairly cramped and lacking what I call 'air', making it a bit hard to read. And there is definitely something wrong with the second line - the break is in the wrong spot. Looking at my Henle Verlag edition, they get more space on the first line by not having so many 32's on the end. Also of possible interest is that they use triplets with curved brackets not rectangular, which seems to make the cramping less severe. There was discussion about how to do these on the list fairly recently.
I am not suggesting you have to copy Henle, but it is very readable/playable edition in my opinion.
Andrew