Using Patch is really the worst you can do to a shape. The patch command is great for closing little holes in a model at places where its just about closing a shape without any visual purpose. The higher the cps and the cleaner the outline, the more likely it will close. But its really just botching.
The false assumption here is, that an outline can indicate a surface. There are better ‘patch’ tools like XNurbs, but the overall issue is trying to fit in a single surface patch to an arbitary outline. Its the otherway around. A surface determines the possible outlines. So you should create them after you defined the surfaces.
Its like trying to fit two different water pipes together with tape, expecting that its water tight somehow. I wouldn’t plug in my washing machine to something like this…