Lots of people have given really good advice already, but here's my two cents... xD
If it looks good, it doesn't matter. I know that sounds very blasé and unhelpful, but truly art is meant to break standards if it is saying something and has a theme to get across. Sometimes, a conversation in a comic calls for big ass dialogue bubbles. So long as it has a composition and clarity, the reader will have no problem with it.
And you calling that dream reader a troll is exactly who that person would be irl--a troll.
If your comic IS mostly text and relies less on visuals, that's something being said there for sure, y'know? It would make me take time to read it, look at the carefully chosen images that go along with the text, and try to understand the intention behind it being made that way.
Checked out your comic btw, and I think it's fine how you have it! It's very by-the-panel, is a square comp in each one, and therefore relies on a bigger dialogue bubble to convey the conversation. I think you're good. :}
