Larson
Hello,
We do carry two sweeps for Larson storm doors, the 40-207 single sweep and the 40-208 double sweep shown in your photos. Based on your photo showing the bottom of the door, it looks like it could be too low and is rubbing against the threshold. It is a fine balance to create a seal between the sweep and threshold without them overlapping. Also, you could "pinch" the ends of the aluminum door sweep to keep the vinyl from creeping out at the ends. Take a look at both of our sweep options and see what you think. Thank you.
I could loosen the screws on the aluminum channel at the bottom to its maximum, raise it, install a new seal and test to see how that goes.
There aren't many technical differences besides the 40-208 creating more of a barrier to keep out drafts and moisture. With that being said, the manufacturer chooses weatherstripping based on the specifications of the door. If you think that the original seal may have had a single sweep and was replaced by the double, we can't be sure of which option would work best for your application. If you decide to give the 40-207 a try and run into any problems, our return policy can be found here.