Terry gave a suggestion on this that I like. There is definitely pressure on your forearm anchor. And there is effort in your spear. What you want is "intention". Focus your attention and intention on getting your spear forward.
Also, finish your stroke to the front. And remember that one of the laws of swimming is that every action accelerates from beginning to end. So the arm stroke begins with the anchoring very slowly and ends with the spear as the fastest portion. I do a bit of one arm free to find this constant acceleration feel. It takes some work to get the arm to spear as one unit with the body, with momentum, and silently. But it is fun when it happens.