Dude, use 43.2. It's obvious and right where you said others with your rifle found their load (within 0.2 grains).
It was asked rhetorically above by shoot4fun whether those were scatter nodes or just disappointing shots. The fact that the 2 odd groups with fliers are 1.5% above and below the tightest group that also has the same POI as the groups on either side points to those being scatter nodes if you subscribe to Newberry's theory on OCW. It also points almost definitively to 43.2 being your OCW.
Load some and try again, run them over a chronograph to see what your velocity spreads are, I'll bet they look good. Shoot4fun gave you good advice if you wanna play around with it and see if you can come up with anything better, but I'd go with 43.2 with the shortage of components at present.