how to exclude images from scrset based on file size (kb)

when I upload optimized jpg images to WordPress, I encounter the following problem: The original image file size is smaller than the auto-generated images (for the 1st and sometimes even the 2nd "smaller" auto-generated size).

Example: Original Image File: example.jpg (77kb, 816 * 612px)

Auto-generated Files: example-768×576.jpg (112kB), example-600×450.jpg (76kB)

anything I can do about this? The resulting problem is scrset, it doesn´t make any sense to deliver a scaled down image to the user if the file size is bigger or equal to the original file! Is there a functionality to "teach" scrset to pay attention to the file size as well?

-thanks in advance!