Thought I'd give an update in case anyone else reads this & its helpful. Therapist said I had medial meniscus damage to some extent (not enough to justify a $500 mri), and when pushing hard on full ROM knee extension like sissy squats, and maybe high tension hamstring work like straight leg 45 degree back extension, it was enough to aggravate that area. A secondary Bakers Cyst developed behind the knee, further causing some issues. I think KB/Goblet Squats, Deadlifts, Swings & Snatches are all fine so I'll stay with those moderate ROM movements for at least a few months & if I want to, perhaps retry those full rom movements again next year. I may just keep the basics though. If anyone else is facing something similar, hope this helps them.