The OP has chosen not to consider a proposed solution. It's his choice, and I have no problem with it. He can ride it this way, or he can on experiment if it bothers him enough.
We can lead the horse to water, but he'll only drink when he's thirsty enough.
To the OP, often when riding no hands we sit more erect than our normal riding posture. This shifts the center of gravity farther back and lowers steering forces, which makes handling more skittish. Often bikes like this ride perfectly when the rider assumes his normal riding posture, and even more stable on descents when the front wheel is yet more loaded.
I suggest you finish the build and not sweat the "no hands" issue if it rides well under normal conditions.
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