Mark,
My issue, which is more common, is the rear lower side skirt bows out.
I originally misread your post. You may want to try adjusting the slider support at a different angle to correct the height.
On mine, I'm not sure how I'm going to handle it other than placing some sort of weather strip on the inside to seal off the airflow from the interior vents. I may be able to do some fine adjustments once the canopy & front windscreen have been completed.
DanLandry
rv7@adv-sol.net
RV7a, N527DL(reserved)
Front Canopy to slider fitting...