I've searched the forum and only found a couple of references to the Astro one piece roof panel.  I was thinking of buying something light weight and easy to get in an out of the car.  I've looked at the Astro top and the Rain Coat sport top.

the raincoat top uses the velcro to secure the top-it also has two steel rods on the outside edge and fastens like the t-tops-it also has two straps in the center of the top that wrap around the t-top center post to keep the top down. the raincoat is very forgiving for body errrors. the only leaks you might have is with the door windows not meeting up completely if you don't get the two bolts tight that go throught the holes where the t-top alignment pin are now. the top works great,can be removed or replaced in less time than it takes a traffic light to change, and can be done by one person without leaving the drivers seat (car stopped) and it folds so as to take up very little space. will hold up at 100+mph

Your stock tops have a bit of factory adjustment in them, especially the corner giving you the trouble.  My advice is to purchase the assembly instruction manual (AIM) for the factory adjustment procedures.  1980 chassis and service manual might also have top adjustment in it.  Be advised the trailing edges of the glass tops sit about 1/4" high at the halo panel.  Do not try to pull these edges down flush.

I have the AIM manual and have tried to adjust but I can't get all of the gap out.  I don't think I'm trying to take out too much based on the driver side gap.

I had a rattle in my passenger side top that was driving me crazy. It would start at about 65 mph, so whenever I was on a long trip on the Interstate, I'd hear this rattle.