I have a set of plans for the Ritz ultralight. An interesting concept.
Unfortunately, the prototype experienced aileron flutter at less than
60knots and came apart killing the designer. The design mods made afterward
increased the stiffness of several components including the wing, ailerons,
tail, and controls. I doubt that it was an ultralight afterward. Anyway, I
have never seen one completed after that.

My issue is with flutter in such a configuration. What are your
thoughts regarding elevator static balancing as insurance against the
onset of flutter. I expect no more than 60knots from this bird.

Don't assume that you can't get flutter below 60 kt. I saw an amazing
video years ago where a poorly designed and/or constructed ultralight
experienced catastrophic flutter during the take-off roll.