Both a smaller wheel, and raising the pick-up on the seat tube, would tilt it back even more. The clamp is as low on the bike as it will go, I've stared at it but cant see a way of dropping it further to help with the level.
Yes that could straighten it, but I think I want to lower the front, rather than raise the back. Another issue is the high center of gravity making it a little unstable.
Both a smaller wheel, and raising the pick-up on the seat tube, would tilt it back even more. The clamp is as low on the bike as it will go, I've stared at it but cant see a way of dropping it further to help with the level.