Maybe try a new bulb of same kind.

Of the two ballasts, one lights either bulb all of the time. The second
ballast is having trouble with both bulbs all of the time. It's been
suggested thay I try a different bulb (brand of), and that seems the most
viable option, especially now that I have 3 ballasts anyway. If that
doesn't pan out I'll go with a standard ballast.

Rod

Rod, I've heard so so things about older Ice Cap E MH ballast. Reef
friends had some serious issues with these.

But the issue should be fixed at this point(I would hope), especially
driving the common 6500K bulb.
I used the Blue line ballast from Champion and was 100% satisfied with
them. Well made, did well.

You can try changing out the MH with a 5000K or a 10000K bulb. Both
are 40-60$ ea though.

Regards,
Tom Barr