It's my fault for thinking some things should be obvious. Do NOT use the barrel adjuster to make adjustments for brake pad wear. As you tighten the barrel adjuster and move the actuator arm forward you start to kill the leverage/power of the brake. I was explaining how to get the caliper in the right place and adjust the brake properly by using the barrel adjuster to help hold the caliper in the right spot while tightening the mounting bolts. Any adjustment for pad wear should be made by moving the adjustable piston in and then recentering the caliper. NOT by using the barrel adjuster(s) for the previously explained reason.