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Did you also change tyre sizes?
For example:
26x2.2" gives 559+55+55=~669mm
27.5x1.9" gives 584+48+48=~680mmDoes 11mm (5.5mm change in ride height?) make that much difference? I don't know, but you should be able to choose tyres to make it equivalent if you wanted.
When people go 700c to 650b they'd talk about how it lowers trail and increases stability with a front load, maybe going from 26 to 650b has the opposite effect and is twitcher? Again I don't know.
I'd be inclined to guess that the backswept bars and short stem might be having more impact.
This is Mrs upsidedown's 26" inbred with 650b wheels - whether I ride it it always feels super twitchy and I don't know whether that's down to the 60mm stem and Mary bars or the wheel swap
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