Haldox, it could just be your back complaining as you are favoring your bad hip. It took my back ages to calm down after I had my THR. It only takes a very little bit of walking at an angle to aggravate you back. Hang in there!
I just have that underlying fear that after RTHR my back will stay the same.!
I could understand the back issues pre LTHR because I had limped ,etc for so long. Im amazed on just a few months my Rhip gives me trouble Im already deep into the back pain and now the Rhip doesnt hurt as bad as it did!

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If the Piriformis stretch doesn't work, get a ball, a round bottomed glass or even a teacup, lay on the other side and use the item to massage the area hard! Do it where you get at the most sensitive point. If you're not on that sweet spot, it's a waste of time.