Don: I may be getting on this question a little late but I had exactly the same issue on my freediving course last year. I have no issues equalizing on scuba but did when freediving. Couldn't get past 22 feet and its in my right ear! I've done just a little research as I'm determined to fix the issue. I too got great advice on hydration, relaxation, clearing very very early and very often but right now I'm pretty sure the cause is the head-down body position. The reason being, I was able to freedive a little recently and when I reached the 20 foot or so limit to equalization I flipped my body vertical and then cleared, it worked perfectly. I was then able to continue to descend and repeated a couple more times on the way down. Terribly inefficient but did give me hope. What I think I may be doing in the head down position is having the wrong head position, staring at the bottom which could be closing off the eustachian tubes enough to make equalization very difficult. My next deep pool practice and open water dives will be to test this idea and look straight out at the line and clear, but still clear v.v early and v. often. Although its a very frustrating issue, I'm glad to know I'm not the only one and I hope this helps with your equalization problems.