I use these now:
https://www.amazon.com/Techni-Edge-T...70_&dpSrc=srch
I get good results from them. I haven't tried a whetstone yet. I'll have to do that, as I generally change blades for each new project.
I agree about x acto blades though... the tips are always pretty brittle feeling to me, they break, usually on the first couple of cuts.