I have two Axis that I have customized and worked both triggers, installed the spring kits. I measured my most current build at 2.21lbs but it still has a ever so slight gritty feel. I have polished both contact point of the trigger. There is a slightly visible groove on the trigger that I didn't quite get all of, so that might be what is causing it.

but my question; has any one tried to drill the trigger to install a allen head screw like the Timmey triggers have?