Hi

If you only experience pain running over 85% intensity I suspect your ACL is managing to stabilise your medial knee and you need to have your running assessed (many physios fail to assess running for lack of space/time/sense).
Concentrate on changing how you run and don’t focus only on your knee. How do you control your hip/back ? Can you correctly weight bear through the knee or are you still compensating for the pervious injury (this is very common and people often guard the knee and never really use the leg properly after an injury/surgery). Leave the knee and consider other options and see how you progress.

Steve
Hallamshire Physiotherapy