Make a proper half loop.

Hi,

I've been able to make half loops that are a bit stretched vertically, but I can't seem to make normal ones. The big problem for me is that no matter how much I smooth it, it wobbles really quickly back and fourth in the POV.

I would like to know as well,

The immelmann loop is only the right way for inverted coasters (sadly) and the dive loop not the best, cause of the wobbling.

In my case I would like to build something like the image below, which is close to impossible without a half loop.