I'm creating one half of an object through lofts and am having problems with getting the shell to work.  I recently had to change the sides from a 2 degree angle to straight.  When I had the angle I had no problems with the shell, but once I switched the top and bottom to flat parts it doesn't want to shell properly anymore.  I'm hoping someone has some insight on what I could do to make it work again.  I need the shell to have a thickness of .09in. because anything under that doesn't seem to work with all the other features I put into the part.  What am I doing wrong?

Thank you for the help.