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My old steel commuter would do it just riding along no handed - I think it was exacerbated by being fixed so the power/flex (such as there was) would come at the same time each time.
I think its also made worse by bigger frames in light steel which is presumably thinner over a longer length than a more compact frame.
Glad you're enjoying the frame, its been a fun build to follow, and those shoes!
branwen
First time for me yesterday: descending no handed on this bike at about 30mph on a slightly rough surface and got a speed wobble or shimmy on the front end. Mildly shit myself and then slowed to a stop.
Checked the bike over, all fine. Nothing mechanical. It will probably be a characteristic of the bike geometry and material elasticity.
On the same ride I had descended faster with hands on bars on a smoother surface and had no problem.
Something to keep in mind.