I believe a good look at the technique and tactic aspect of your skiing may resolve your issues.
Currently, you are a bit heavy at the bottom of the turn and a bit abrupt at the transition. A softer transition and moving the speed control to the top of the turn will probably relieve much of the impact forces to your knees.
Bruce, thanks for the thoughts, and, I agree. I was working on my release technique last week to find a less stressful method. What worked was simply rolling off of my weighted downhill ski to flatten the ski, it helped reduce knee strain, don't know if that meets your definition of "softer". I fought the top of the turn quite a bit, in part, due to skiing 98 width skis which I never use at home. I made a major error not bringing a narrower ski. When I am not clean in the top, then it does load the forces in the bottom and my knees pay the price. This is especially true in harder snow, far easier to ski clean when soft snow exists. And, speaking of heavy, I am 10 lbs heavier than last season...that sure does not help.
The technique answer is to spend some time in Taos in March...do you know anyone who will be there? Keeping up with the flying Grump's is a whole other issue.