kilroy,

I am not now a runner, I used to
I am sure you are using heel pads? The only thing that has ever worked for me in regard to running, when I did run, was to just do what I could. trying to push it, always made me very sore or tore a muscle I think If you keep at it, you will be faster...
I was never able to push it, just able keep at it until before I knew it ...my time was much shorter..

I would give anything to be able to run for 20 minutes now..

I keep the New Covenant,
when I fail....I am pulled
back into place by HIM.