Hi ioVideoMaker, I'd say that the root of your problem is trying to do too much all in one single loft.

Loft is primarily a surfacing tool. You basically want to use it to generate one sheet that has a single shape to it.

In your model you've got a lot of tight bends in your profile curves - those are places where there should be a transition in between different surfaces, usually that is done by having pieces meet at a sharp edge initially and then apply a fillet for the transition piece.

It's difficult to get a good quality surface when you're incorporating a whole bunch of these transition areas right in a single go of Loft.

So a kind of better direction would be to have fewer profiles and generate an initial shape that has sharp edges maybe ignore the very top part to start with and get the main body part set up with a cleaner simpler structure.

Your current one has so many profiles with so many different shapes trying to connect together into a single surface that it becomes stressed and has bunching and buckling in it rather than relaxed and simpler surfaces.

- Michael