Not sure if that will cure the issue, the right side is already tight. Not there, can't really say, just going from sum what past experience.Raise the pole.
The dealer has informed me that this is a common problem on 280’s and that they will refer it to a canvas shop when I bring it back to them at the end of the season, a second pole is a possibility. Service and support from the dealer has been exceptionalTalked with my canvas guy with 40 years experience, he said it was made wrong. He said that there is a lot of pressure on the forward port snap. He said in order to fix it you have to release the pressure on the forward snap, and that would be to add some more fabric in that area and a new snap, then you could work on adjusting the back. Or have a new one made. He said it's happened to him before, everything looks great and then an issue develops. Please let us know how you make out.