I am not sure why you had to add the edges running into the top and bottom sections. You could control that curvature with the edges running around the middle.
But to be honest it would help to see what shape you are trying to model because it's hard to suggest anything from just the images you've posted.
I see lots of tri's and really long slim poly faces which are going to pinch and crease.
You should avoid long slender poly faces and narrow triangular faces on a curved surface.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 23-10-2013 at 11:14 AM.