should be OK in a drysuit, but make sure you do the proper checks, i.e. can float your rig on it's own. The 133 is probably pushing it in a 30, but in a drysuit it's less of a problem unless it is a neoprene drysuit that isn't crushed
This is partly based on assuming that if needs any extra lead, he wears it on a belt and doesn't attach it to this rig, right? If he needs lead to sink himself in a dry suit and he puts weight pockets on a tank band or he puts weight pockets on his rig's waist belt, then the 30# wing might not be enough to float his rig, yes?
I'm definitely not saying he should get a bigger wing. I'm saying if this is true, it's worth noting so that filmguy is aware of the limitation and makes sure to wear any extra lead he needs on a weight belt, instead of attaching it to his rig (if he's using a really negative tank).