I was able to find a solution, so I am sharing it here in case anyone runs into a similar issue:
Important notes, your section ID will need to be updated with your own ID, and you need each image block authored to be in either 3 columns or 2 columns for this to work. If you have multiple sections where you want this to work, you will need to add this code for each section.
//equal size blocks//
section[data-section-id="5f561a6cfab9b365a25a1e21"] {
.sqs-col-3, .sqs-col-2 {
width: 20% !important;
}
}