Well, I did it this morning, with my new "rules":
I ran off the concrete as much as I could, from 90% down to about 40%; I ran on grass next to the path, instead of on it (apologies to the City of Redondo Beach); I took the dirt track whenever possible; I took the road instead of the sidewalk when safe; I practiced my downhill posture (felt reallty weird, like I was hunched forward) and yeah, towards the end I was hurting.
The good news is that the shooting pains were gone. The only hurting was the dull aching in my hammys and glutes after mile 6 or so. I suppose this is the "good" hurt, right?

Thanks for all your help, gals!