I have similar issue with Kefu and Jtrue.
Recently, I have tried deep massaging my knee at the crossection between IT Band and Patellar tendon (Near IT Band insertion at the knee).
And I got some improvement.
I did it myself.
I actually use a cupping cup to massage it but without vacuuming it.
Just using it as a simple massaging tool, I find it effective at delivering pressure and shear to the area.
Maybe you guys can try it.