Well then, and you're not really going to want to hear this, but the more buttons you add to an interactive PDF the wonkier it's going to get. There's really nothing you can do about this and to be perfectly honest, unless you can control who's viewing this and what application they're using (buttons don't work at all in many 3rd party PDF readers, it's pretty much doomed. And, keep in mind that it won't work at all on mobile devices which have no concept of rollover effects.
I'd advise you to re-think the entire project.
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