Not sure if this will help but I had a similar problem plus it was noisy on the highway. then I heard of the hockey stick fix. What you do is take a piece of wood (broom handle sized) and cut it so that it can be nicely jammed in the center of the top next to the liner between the front and rear of the frame. What it does is add some additional tension to make the top fit more snugly against the car's frame.
I've had that piece of wood up there for maybe 12 or more years.......
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'04 996 GT3 (SOLD)
'87 Targa (Retired DE car-bought new)
'13 Cayenne Diesel
'14 BMW 428xi
'09 Boxster S (sold)
'02 996 Turbo (sold)
'04 Cayenne S (sold)
'98 Boxster (sold)
'84 280Z Turbo (sold)
'61 Austin Healy "Bug-Eyed" Sprite - High School chick (?) car (sadly sold) 
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Some luck lies not in getting what you thought you wanted but getting what you have, which once you have got it you may be smart enough to see is what you would have wanted had you known.
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