I've discovered another component to the tip steer issue--unknowingly letting my elbow flare out a bit when getting into my stance.
I previously thought that just correcting my stance would automatically correct my chicken wing problem, and for the most part, it did. But a slightly diagonal elbow position remained (maybe 5-10 degrees off of completely vertical on the shot line).
It was actually a comment Mark Wilson made about Filler where he kept his grip hand close to his hips/waist as he lowered himself to the table that got me thinking about this. When I would airstroke during my pre-shot routine, I wouldn't bring my hand/elbow in, and would instead get down into my stance from that airstroke position, causing the slight chicken wing.
I've found that intentionally bringing my hand in towards my body as the last step before getting down on the table keeps everything lined up better.
When I combine the bigger step forward + the more relaxed/inward hand position, I don't have any problems with tip steer and my overall accuracy is better.