Stackedplot labels rendering

Hello all,
I’m using stackedplot() to quickly visualize some simultaneity in all-in-one synchronized (synchronize() is great for that) timeserie from 3 sources of experimental data. To get proper simultaneity view between the subplots, I forced the y labels thanks to DisplayLabels parameter a can be seen in the screenshot


However I didn’t find how to get a more suitable rendering of the y-ticks labels, with a more appropriate number of digits depending of the value range (in the screenshots, subplot 1 3 and 4 at least could be improved). Do you have any idea how to fix it ?
In addition, I was a bit puzzled by the LegendLabels behaviour : actually it doesn’t show any visual impact on the figure, is that normal (also when running the last example in the help page ? plus the result is slightly different from the one of the help page picture on the y-labels that are hoirzontal/vertical ) ?

Thank you ,
David