Just a quick one tonight - I got this far:
and realized that the look of the purlwise increases sucks. I thought they would be pretty invisible, but I think I'll have to rip back and align them in proximity to the twisted stitch waves so they look like part of the design rather than random wonkiness. (Even the cat is disdainful, though he might just be crabby about the daily ear stab and therefore less than objective in his artistic criticism.)
I'm going to rip back to the dotted line:
I terminated one out of every 4 waves at the bottom of the neck and had planned to terminate 2 of each remaining trio halfway down, with an embossed motif (likely a bear claw) to go at the end of each single wave, just below the point of the shoulder. Looking at it though, and trying it on, I think I'll keep the extra waves after all - it will disguise the increases more effectively, add stability to the critical shoulder area, and generally look better.
I'll give more detailed math once I'm happy with the yoke, however, for those who are proceeding freestyle, what I've done is this: divide the cast on number by 8 to get the number of segments (in my case 11). I'm working a single increase in each segment every third round in order to reach my maximum yoke circumference at the appropriate point. (If your cast on number is really different from mine, the distance between increase rounds will likely also be different.) At the same time, I'm waving the three lines in each segment back and forth and simultaneously spreading them out a bit as the increases give me more room to maneuver. It is actually simple enough to doodle up on a piece of graph paper.