Slight miss when cruising

If your float levels are a bit low, it changes the Sg of the fluid in the bowl, because there is less of it on top of the jet and can cause a lean condition.

The reason you aren't experiencing this when you stomp on it from idle, is because your fuel level is higher and you have accelerator pump.

I'm wondering if you aren't running enough fuel into the bowls under cruising conditions.

Big lines would help, but what is your fuel pressure at right now? Can you monitor your pressure under cruising?