You cannont punish his wakeups on reaction. When you try to stuff his teleport, you are guessing. There are not enough recovery frames on teleport for you to see and react using slow ass venom as a punish.
I don't really see how DD has advantage against Shazam. Shazam has the advantage in mobility, so he doesn't really have to fight doomsday up close. Shazam should focus on moving in and out of DD range, whiff punishing whenever possible.
Against Grundy, I don't think he has many problems either. Again, Shazam has mobility advantage. Sure, Grundy does 50% combos, but guess what? So does Shazam! Shazam is gonna do around 40-52% every time he hits you. Also, I think Shazam has an easier time applying pressure Grundy on wakeup than Grundy does against Shazam.
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