I can't point you to anything specific, but I do know that you shouldn't ALWAYS be using the gatsby-image plugin, especially if you're using pagination. I think it's one of those where you have to grind through it for a while before you're really comfortable with it. I'm most of the way through Jason Lengsdorf's Gatsby workshop on Frontend Masters and there's a pretty lengthy section on images, so I'll report back if there's anything key that I find out from there.
I ended up using flexbox instead of floats, and it worked fine.
That'll do it; you don't want to use floats in this day and age unless you absolutely, positively have to.
Floats are nice for wrapping text around images though.
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