For anyone who may be having similar issues, who stumbles across this.
I was able to resolve this issue using the native 7.1 accordion blocks, without reverting to classic editor blocks. It was as simple as removing the span style for the titles. Fluid Engine seems to see the style coding and is treating it as plain text, which increases the grid size needed for the block.
In my specific case, I used an HTML bold tag on my titles instead of the span style. I was able to style the bold tag in CSS to get the look I was going for, which cleared up the excess dead space below the accordion.
