We've had the same problem with the door rubbing on the awning - getting the 4th hole is sometime a real... issue... Several people I've talked with have had David Tidmore in Weatherford, TX add the Awnbrella bows which absolutely took care of the problem. Also gives runoff height for rain water.
Made the mistake once of having the awning all pulled out equally, (w/o dropping one end a notch). Came back at the end of the day after one of them spontaneous, completely unexpected and unforecasted Texas gully washers. Had to replace one sides support arm... rain water weight bent that sucker in the most amazing way (incredible how much water an awning can hold before failure!). Always drop one side a notch or two... looks funny but not as funny as one of the supports bent in two.