Also, a cue that people just get sometimes(like a light bulb went off)

Your lower back needs to be arched to activate your lats - at the point of contraction, where AG mentioned cracking the walnut, also pop your chest out as you arch that low back and you'll get it in due time(back is our only mucsle we can not see therefore mind muscle connection is key)!

also try to internally rotate your elbows in to engage the lats even moreso!