Ever since you started building it, it looks like something is a little off. It must be the jack stands.
I cant help but think about it and I have been feeling the same way. So I stared at it for a long time and you know what. Its not the tank. During my brain storming i looked at some pics of a 1920 indian daytona. Both my bike and the daytona have a similar curved frame. After looking at the daytona i figuered out that my frame has to much drop from middle of the bike on back. Its like the rear tire is up way to high. Makes the stance look off. However, to fix it theirs alot of s**t I have to cut, and repaint. Not to mention re aligning the entire drive wheel, chain, and brake. So what i am going to do is keep everything intact on the rear forks. Then cut the two top support bars right where they meet the main spine tube. Then cut the two bottom bars right where they meet the peddal cup. That will seperate the entire back section off the bike. When thats complete i will raise the frame higher almost like folding the wheel under the bike. Then i will reweld the 4 tubes.. notice on the daytona pic. Under the seat where the frame and rear forks meet their is a break in the angle. The rear forks after the seat drop in angle. On my bike the angle stays the same all the way through. Gonna have to play with it a bit once i cut the rear off my bike. To me it looks like a good 3in or so. You have no idea how hard it was to find what was off on this bike. My fuggin brain hurts man. Step one complete