I've been using an 11 ft. hammock with the 10'10" ridgeline for about a year and have had no issue with coverage. Of course, it depends on your suspension. I'm using Dutch Whoopie hooks. With my hammock ridgeline at 83% (109.56") and continuous loops through the channel that add another 5 inches to each end, that gives me a little over 10 inches of additional coverage over the hammock ends (130" minus 119.5").
If I'm worried about rain getting in, I just close the doors.