You've probably picked up on this already, but if you just reverse prop direction and see immediate improvement, then it means your plane was out of trim, but doesn't necessarily mean you've found the better prop rotation direction.

If you're flying at a level high enough that prop rotation makes a difference, then you need to re-trim the airplane to the new prop rotation, so if you take a super-well trimmed plane and reverse the prop, the first thing it'll do is disappoint you.

My first reaction was that I liked it running backwards.  One day after a couple hundred flights I chipped a prop and only had a normal one with me.  So I switched and the plane seemed to fly better.  Since then I have used tractor simply because you can get them easier.  I don't think it makes a flip of difference once the plane is trimmed.  Sometimes we confuse different with better.

Ken