Wondering what these involve?
Spongebob, here is an article on the tendinitis you're questioning -
Psoas Tendinopathy and surgery
If this is what you suspect, its time to revisit your surgeon for confirmation.
We are not able to diagnose any complications you may be dealing with online. Our best advice has been for you to STOP the SLR's and give all other exercises, gym, swimming etc a breather for at least several weeks, and engage in walking alone to see if it makes a difference. It seems it's not advice you are interested in following, so it's really best you go back to visit with your OS again, follow his direction post diagnosis and if there's no improvement, it may be as good as it gets for you.
I will mention once again that in the past you shared that your discomfort is at a 2 on a scale of 1-10. If that's still the case, I am truly sorry, but many live with much worse. Pain free may never be attainable. I understand it's what we all hope for, but sadly it does prove elusive for many. Best wishes going forward.
@Spongebob