Malcolm - PF is an over stretch issue, and because of this really doesn't do well in the long run with excessive stretching. It needs to restored to its normal lenght but not beyond.
The issue with jabs is that they may well deal with the inflammation, but if you haven't dealt with why you've got the inflammation then problem may go, and then reappear later.
Jabs into the PF are at best very painful (sorry!) and controversial, BUT do helpwith some people especially if evrything else has failed....
Go easy on the massaging, go big on the stability and control - what's you 1 legged balance like?