Have you done your high hamstring?
Adductors?
Psoas? This can change the position of your pelvis.
Have you worked up/downstream of the knee?

Instrument Assisted Soft Tissue Mobilization is very effective with breaking up scar tissue.
It is not a matter of how hard you are smashing. It is if you are effecting the targeted tissue?
I’d recommend using the 80mm supernova. It creates higher global shear pressures.

Yes, scar tissue can be broken up. I have an of incision which was opened twice and have no scar tissue in the area. Yes, I work on it regularly, however, this is what is required for it.
It’s learning what methods, tools result in the best results for you.

I work with a construction worker who has scar tissue along the IT Band area who has seen great results. I work on it weekly and it is progressing nicely. Starting at his hip and down the quad to the knee.