Make sure you have enough commas in your other ones that they do not get back to the spells until they are off cooldown/need recasting.
This lets it cast lightning bolt whenever the others are on commas. It is the most reliable way to do the fallthrough part of the macro, and I believe the /clicked macros can only do castsequences of normal spells rather than /cast. Thus putting it in the main macro.
Either way, having the fallthrough in the main macro is how everyone else has been doing it.
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