Your chain wrap would be (50 - 30) + (32 - 11) = 41. Better, but still just outside of the derailleur range. You could probably run it like that, if you were careful never to shift into the big-big combination, which could damage the derailleur.
Your 50-34 double with the 11-32 SRAM cassette would actually have a higher lowest gear (34-32) than your current 50-30 and 12-30 (30-30), so you would actually have higher gearing on the low end than you currently have, and just one more tooth on the high end (you wouldn't notice it unless your regularly pedal at 30+ mph)
If you really want to run the 11-32, either keep your current derailleur and never shift into the big-big (30-32), or upgrade to a mountain bike rear derailleur. If you choose the latter, be sure to get a Shimano 9-speed mountain bike rear derailleur. The 10-speed mountain stuff won't work with your STI shifters, but the 9 speed will (what I'm running on my bike). Also make sure you don't get a reverse-normal derailleur, which will reverse your shift levers, but work fine otherwise.