I went with the standard blast shirt after buying a 2-ply because I lift in 2 different federations, APA/WPA and USAPL. Since USAPL only allows a single ply, poly I thought I would go with the baseline and go from there so if I grew out of it or blew it out or whatever I would only be out 50 bucks. I bench 330 raw and only put up 335-340 with the standard single ply. I bench 365-375 with an hphd 2-ply.
But as stated before everyone is different. Perhaps you can pull a little more out of it than I did. Good luck!