If you are needing left rudder, I'll give you 10 to 1 odds your landing gear isn't straight. You need to get your main wheels straight first, then get the tail wheel tracking right. I think the value of toe in is debatable. My Cub is set up perfectly straight, and I love how it handles. That plane was an absolute monster to take off with though when I first got it because the main gear wheels were turning a bit to the right. I had the tailwheel set to make the plane roll straight, but of course as the rudder gained authority during acceleration the plane would go all squirrely on me. Ground handling on Cubs is a multi page conversation for a lot of guys, but in my experience it's not really a big deal if your wheels are set up properly. An Ugly Stick taildragger will let you get away with a sloppy setup, but a Cub won't.