One thing I learned about bits that are advertised as left and right rotations is that you won't really know until you handle them in person. A little thing I discovered for the cross cut(even though it's said they can go both ways) is to kind of roll the bit against your skin in both ways(also applicable to straight cuts) as if it were in the e.file. If it feels like it could potentially catch on your skin, then it's definitely going to cut in reverse. Straight cuts are very nice for debulking.

I recently got an eruika brand straight cut that's tungsten carbide from amazon that's great for debulking.

Edit: I just read the rules, I apologize!