The very best of luck Andy… it sounds like a determined blast from the medics to get those pp's down a bit more… enough to set a plateau for your SCT (20 ish?).8-)
Although your pp's are resisting the treatments they are not moving either… so it sounds like a stand off. I am sure this rather drastic set too will do the job… and you are in the right place under close scrutiny so side-effects etcetera should be spotted and alleviated as they go along.:-)
I have had nearly everything on your list… but not all at the same time.:-D 😉 😛
Regards
Dai.