way to go but do whatever you can to get that full flexion . you need 110 degrees just to go down stairs! the closer you get to 150 ( if your device flexes that far) the easier things will be in my experience. I did tons of supported squat holds to get that stretch reflex to let go and give me more depth; using gravity. One thing most therapists I see miss is the importance of the calf, specifically the soleus, in allowing knee flexion. I worked that bad boy hard, in every angle imaginable. soft tissue work as well as stretching and toe squats. swings always helped me stay strong and resilient with very little stress on the knee.