"Note we've entered the Roth contribution but Turbotax isn't using that information to reduce the deduction or even to flag that there's an inconsistency when it checks the return."
That's correct behavior because the Roth IRA contribution does not reduce the amount that you are eligible to claim as a self-employed health insurance deduction. The same compensation can be used to support both because the Roth IRA contribution is nondeductible.
