I did a quick process.
Here is M8 with the ED127 and Astrotech 2" flattener from last weekend, taken through light cloud:
http://deepspaceplace.com/show.php?id=ngc6523b
And here is the same target & scope from last year without the flattener:
http://deepspaceplace.com/show.php?id=ngc6523
If you zoom in (click on the image), the corners look better in the one with the flattener. I think it's a good match for this scope. I also attached a CCD Inspector report.
James