I have an EAA Witness 10mm with a single action trigger installed that I purchased used a bit ago. Before taking it to the range for the first time I changed out the recoil spring to a 20lb. I was reading that its a good idea to run the 20lb for the 10mm. The one that came with it seemed to be weak, maybe around 15lb or 16lb. I get some hammer follow about every 5th or 6th round and the hammer, when it does the follow, stops at the half cock point. Im wondering if its the stronger recoil spring making this happen or something to do with the single action trigger. Any advive on possible causes?