This trade started out as a same strike calendar with the back month at the 40 delta strike and the front month at the same strike (see Post Below). As price has moved and I've rolled aspects of the setup, it has now morphed into a diagonal, with a roll today from the October 13th 138 short put to the October 27th 138 short put for a realized gain and a .26 ($26)/contract credit to delta balance the setup and to further reduce cost basis since the short put was approaching 50% max.
The previous scratch point was .72; it's now .46.
Unfortunately, I don't have that many roll opportunities left to further reduce cost basis, so I'll need some fairly significant movement toward the put side to bail on this prior to back month expiry ... .