Decided to roll the dice and rent a 2PH rig for a day...
now pointed at eusolo.ckpool.org
Wish me luck, I could do with some right now.

Well, that was disappointing.
19.73B best share. Shockingly bad.

The rig sustained about 1.9PH so no problem there. There were a couple of big rejects but generally very stable.
This goes along with the low return share values that I've been seeing on my own rigs.
I know I know, random and all. Beginning to wonder though.