Fenders and keepers
Jim, consider if using fenders and keepers would help you sit safely against the T head. Some marinas allow you to install additional fenders on the dock or pier. Another thing that I do along with most of my slip neighbors is to use a keeper. It's nothing more than a small block attached to the dock with a weight tied to one and and the other tied to your boat. Depending on the weight of your boat anything from a 5 to 10 lb weight will, in normal conditions, keep the boat snugly against the dock. I'd also keep in mind what strentgh and where the prevailing winds come from in relationship to the T head. If they typically blow hard into the T head then you may want to look at another slip.
Good luck
Mike