I'm about to have my carbon steerer cut after experimenting with the stack height. There is conflicting information online on whether or not to leave space for a small spacer on top of the stem when cutting carbon steerer tubes. Apparently, different manufacturers have different recommendations (Cannondale, I think, says not to leave a spacer on top). My bike is from Giant and I can't seem to find any manual that specifies this issue. Of course, flush looks better, and I see a lot of WorldTour team bikes that have it flush so it must be okay(?). What do you guys think?