Fixed it accidentally!!!
While trying to get rid of the margins left and right of my gallery in mobile view, I did this:
‘.entry-content {
margin-top: 10px;
margin-right: 0;
margin-left: 0;
}’
Then I resized my window to medium size and the pictures stretched to the sides, negating any need to mess with centering. Wahoo! Hope this helps someone else in the future.
