After taking a full week vacation where I posted whenever I got up at more random times instead of when I consistently leave for work, the post timing does not seem to be as critical as I thought it would be. I thought that was pretty interesting. I posted anywhere from 7 to 12 EST and overall likes and comments seemed the same to me.
Otherwise, it still seems random what people will enjoy more. I've been making 2 posts at the same time, and I'm rather poor it feels as to predicting the one which will be more popular. Even stuff that is slower one day will do better another day. Psychology or marketing aren't my thing, it would seem.
People still like what I'm doing, and I feel people have been having a little more fun in the comments, so that's what matters.