The corona of my glans has changed shape, too, like yours. It won't lose size. If anything, your head should be getting bigger. Try putting more force on the CS during jelqing to get that head pumped. Squeeze it up as big as you can and hold it. Kegels help too. I always jelq between sets of stretches. Stretch it, blow it up, stretch it, blow it up...
Penis Enlargement and foreskin restoration has really changed the way my cock looks. The only side-effect that I am not happy with is the discoloration at the very tip of my dick, and I am not sure if it is from either or both. I think it looks weird, but my wife says she thinks it's neat :s It's probably not as noticeable as I think it is, though. I tend to be a little preoccupied with my penis at times...a rare thing here, I know! :D
Still, compared to the overall length gains, girth gains, straightening curve and growing foreskin, a slightly different shaped glans is not such a big deal...