With 40A, the PSU should be fine. As far as I know these 49 port hubs using the 5V rail, but I could be wrong.
Having the same issue with one or two Ants might be a sign the current limitation is actually on the hub. Something like mentioned here. With other words, you will not be able to fix it without soldering (the hub).
You might try to get one of your Ants above 2.2 GHash/s on a single usb port on a PC / with a different powered hub, just to double check.
I use v2 of the 49 Port Hub. Those are powered by a 6 pin PCI-E power adapter.
A few minutes ago I tried another PSU (24A@12V) Just to be sure. Exactly the same Problem. Will try the sticks solo tomorrow.