Thanks Shadowzz4 for your advice! I will add that in to the list.
I have indeed read a lot in regards to glutes and bret contreras. I think my hamstrings were taking the workload from my glutes when I was trying to strengthen my glutes. I have to figure out ways to address this. One thing I noticed that seems to help a little is “smashing” (rolling out with lacrosse ball) the psoas, TFL, and top of rectus femoris near TFL than stretching rectus femoris/hip flexors right before my glute strengthening/activation workout. I also try squeezing the glutes as I perform my strengthening routine. Even so, I think I might be overactivating my lower back and hamstrings still (but to a much less degree than before). I am starting to feel slight SI joint pain perhaps due to lumbar spine hyperextension during hip thrusts/glute bridges.
I wonder what the effect of doing electro-accupuncture on my TFL and psoas a few hours prior to glute activation/strengthening. Do you think that would help in terms of glute activation? theoretically it would allow those muscles to relax allowing more activation of glutes during glute exercises?
I have found a glute strengthening expert and patellofemoral pain expert named Chris Powers, but he is not even close to my area (he is in Los Angeles and I am in Toronto Area). He is a field leader in glute strengthening for patellofemoral pain syndrome. First one to link weak glutes to patellofemoral pain syndrome. He has a facility were they do biomechanical testing and physiotherapy protocols: http://movementpi.com/about-mpi/
It would be nice if I can find someone similar but closer to Toronto.