However, here's where I am on one of the socks (having speared the heel flap with a knitting needle to keep it from curling so much I couldn't photograph it.)
(R) Eye of Partridge stitch above, stockinette below (L) Wrong, or "inside" of heel flap showing EP purl above, regular below
I don't think I'll be using it on heel flaps again--will try "heel stitch" instead--but may use it on small decorative areas, as on afghan or scarf segments. Also don't think it looks much like a partridge's eye, but as there are thousands of stitch patterns, finding unique and appropriate names for each one must be difficult.
Since I didn't do the sensible thing and do a pattern swatch before starting it, I know it's affecting my gauge but not how much. (Yes, sometimes it really is smart to do that swatch ahead of time. Sigh. Well, I have two more balls of green yarn to play with, if these socks turn out to be a very difficult fit...)
Another bit of advice-from-experience: don't try a new stitch pattern when you're in a hurry and have a hard deadline on when something must be done. Too late now for me, but maybe that will help someone else. If I'd just knitted the heel flaps in stockinette, as I did the first two pairs of socks, I'd be a lot closer to turning the heels (which I'd planned to do today...I would've finished the heel flaps yesterday or early today. Minor adjustments done with fitting, like the 4 stitch decrease mentioned above, don't slow you down nearly as much as having to remember which row you're on for patterning. If Interrupted, I can stop stockinette anywhere--I'm either knitting or purling whole rows at a time, and all the knit and purl rows are the same. Here...no.