Try contacting BAS. In less than a month of having my new top put on, the right lower corner
of the rear window started to separate from the fabric. Sent BAS a picture and they sent out a new top that day, no questions asked.

 

If you loosened all screws in the front ever so lightly so that you can pull out a little fabric (needs to people preferably) and as you go, re-tighten the screws, that is all you can do as far as micro-adjustment. My top was similar but that helped. Then, we closed it and there was still a slight gap in the rear, even though latched. That rectified itself after 48 hours in the sun.
Also, it took me, reaching around to the edge of the top and pushing down, while latching it in place when closing the top for a few days. Then it let up and fit perfectly.
It truly does stretch.
Interesting thing is, a forum member got the EzOnTop described above and had the problem of it not being cut correctly. But that time, the company did not stand behind the product. So he will not be using that company anymore. We had heard great things about the EZ-On Top before.

That said, Ez-On is a lot more expensive than BAS and besides the window that is stitched rather than glued, there is no benefit. I will say this, the wrinkles are totally normal. The OEM top had it, also. That is just where the top folds. You can try steaming it - there are a couple of videos online but it usually comes back eventually. Not bad enough to be bothersome in my opinion. If someone wants a top that is as close to OEM as it gets, BAS is the way to go as they use the same materials.

I think yours will stretch and you will ultimately be happy. Or loosen those screws again and really pull out while you tighten the screws and work your way from one side to the other.