Im using this recipe, I think I'm over mixing my macarons during the macaronage stage? This is my second attempt, my first attempt was a complete failure, they were reallyyy runny. My ribbons aren't as thick as some of the videos I've seen like this one but I kept checking and they never got close to that.

I was also wondering if I might've over mixed my meringue, after I got stiff peaks I continued to beat it for about another minute on medium high speed, would that be too much?

The shells came out cracked, just slightly concave, and with no feet. I googled these issues and it seems like I am over mixing. Before I try again I just wanted to check if anyone knows anything else that I might be doing wrong? Thanks for the help.