RE: Need help with really long take off runs
Look carefully at the plane's attitude on the ground.
Make sure it isn't "nose down". Even a little bit can cause you to struggle, especially when "learning".
I've gone so far as to make some of my planes a couple degrees "nose up" before, by
sliding the nose gear down farther in the bearing or engine mount. (if you have enough adjustment)
Worst case, yeah... go with some 2.5" or 3" wheels, if you're running smaller right now.
Won't hurt a thing