roof leaks after ice storm

In January of 2009 we experienced a horrible ice storm that produced about 2” of ice followed by numerous days of snow on and off. The ice topped with snow did not budge on the roof for over almost 2 to 3 weeks if not longer. The building was built in 2010 and is 72’ x 198’ with a 12 ¾ pitch. Immediately after the ice had melted enough to slide off the roof I started having random leaks all over the building. Some leaks are consistent and some are so random it baffles me. On a bad day there is close to 20 leaks. I know a couple of trusses are bowed from the weight but there is not enough of them damaged to be the cause of the leaks. I do not have the anti-syphon metal and my screws are not in the valley. I know that ice damming occurred, however, only a couple leaks are close to the edge the rest are too far from the edge for the water to travel up. I also know that the building was overloaded and since it is agricultural I know that the weight load is not as high as commercial. Originally I suspected the ice had grabbed the screw head and ripped them loose causing the problem, however, after numerous random screws being backed out to check for damage it was evident that was not the problem. The insulation is standard blue board held together with duct tape. I know the overload caused the duct tape to give way in some if not most areas. There are no leaks near the ridge cap and it is still in-tact. My next guess is the metal stretched between the trusses which created a wick type problem. I only assume that if in fact the metal did stretch. Do you have any clue what might be the true cause of this problem? Since we are in an area that does not normally take this type of load on I am unable to get any help. Thank you!