You can try to change unit size bigger so the needed amount of units per direction becomes smaller. It can have some side effects but it all depends what kind of widgets you are using so can't tell.
Just play with numbers to figure out what will be the best.
Next options will be to migrate from dashboard to ...
Actually I had no problem to set a width greater than 30, it's just the layout of widgets which does not work well after 30 , as shown in the picture from the other linked topic :