The AIM server is still running 2.17. With 2.19 coming out today (but announcement postponed until the release notes are finished), the AIM server will be upgraded this month to 2.19. And in 2.19, Glenn has done some excellent work for things like this. So whereas currently, PTX-WW javascript is responsible for the feedback thingies that are adjacent to answer blanks, now in 2.19 that is done at the source, with PG. And it is done well, not hacked together on the surface at the end of the rendering.
So I think you'll be happier with that after the upgrade. With two answer blanks and singleResult true, there will be only one feedback button. By default, placed by the last (or is it first?) answer blank. But there is a way for you to control it yourself if it works better somewhere else.