>...i suggested M-7 for re-rentry only because it's fracking "virgin" just sitting there all these years awaiting its chance.

Well, she's not the only virgin in the onion patch, don't forget her little sister M-4 is a virgin also ;)

>Then again, the geology and data gained so far suggests that big flows may not be achieved even from deeper formations without drilling horizontal extensions into sweet spots.

Even if it was possible to achieve big flows from the B. C. but you want to leave as small a footprint on the landscape as possible.