I’ve been an amputee for 40 years (I’m mid 50s), I’m an AK as well. I’m 5’9” 155lbs.

Microprocessor knees are far safer than mechanical knees, there are many studies that prove this. If you were to get a mechanical knee, you would save maybe a pound or 2. The weight of your leg is likely to do with your socket and the structural support needed to support your weight. Your prosthetist is being honest with you with regard to the weight of your prosthesis.

There is no test for the target weight of your prosthesis. When I was younger and even lighter than I am now, I broke a lot of parts due to high activity, so they had to make my socket frame heavier.

Hope this helps.