I've used the CX750 to run two Ants, RM850 to run two Ants, Antec HCG-900 to power two Ants, EVGA 1300G2 to power three Ants, and Rosewill RBR1000-M to power two Ants. I really haven't had a bad experience powering Ants.
The only PSU I was a bit uncomfortable running two Ants with was the CX750 because it was drawing 850 Watts at the wall, but the PSU worked for a week or two until I was able to replace it with a better PSU.
In my experience, Ants aren't that picky about which power supply you use as long as it's not a complete piece of crap.
That's interesting, I have to do some more testing then for sure, to see if something else is wrong. I have some various PSUs, including a few CX750 but have not dared to try 2 x Ant's on those. Are you using US source voltage or EU? Although I guess that really shouldn't matter...