Get some nylon rope, several sizes, and cut to fit your t-top then melt the ends and put the nylon rope in to the lips of your t-top seal. do the same with the front door pillar seal.

 

It might not just be the weatherstripping. I know in my car the window dint go completely up or not as much as it could. Try to make your window roll up higher by taking off the door panel and adjusting the track. Its pretty simple stuff.
http://www.nastyz28.com/forum/showthread.php?p=1442321

 

Yeah my t-tops used to leak alot and I put some silicone and it didn't completely fix it but it reduced it alot. I just got some weatherstripping off another camaro and poured water on to make sure it didnt leak adn they are goood! Got the pair for 40 bucks! Now just need to swap them out