Wow, that sounds great!! It is so reassuring to hear that. As far as I know, there are 2 more IL-17 inhibitors in the pipeline. One of them blocks both IL-17A and IL-17F (the current IL-17 inhibitor, Cosentyx, just blocks IL-17A). And then I know the are JAK inhibitors like Xeljanz coming. Xeljanz has already been approved for PsA.
I would definitely do the MRI. At least then you will know if you're dealing with inflammation or something else. PT would help with muscular or even mechanical pain.