A quick update - new I5's arrived, DGS300 white dot, what a big difference over my last set. I know my old set fit well when I got them, but had not checked them on a lie board since. A difference of 2.5 degrees in lie angle between those and my new irons, a significant change. I can see now why I had plane trouble, because that was the only way I could hit clubs that didn't fit.
Note to self - check yourself on a lie board at least once a season

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"Support the On Plane Swinging Force in Balance"
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Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D,
6-B-3-0-1, 6-C-1, 6-E-2