So I was thinking along these lines as most of my double digit friends have issues with longer clubs and get really anxious which compounds the problem. When the trust leaves the tempo goes to hell and the likelihood of you hitting the center of the clubface with a longer shaft is compromised. Given you have average swing speed, hitting a modern 5 iron is very doable.
I agree with this as well especially with a 3 iron. Hybrids are a bit more reliable for mid caps and definitely more versatile from tee, fairway, rough, and fairway bunkers.
Looking at your backswing position, you have some real opportunity to improve dramatically in short time with some proper instruction. Once you get a reliable and semi-consistent swing you are fine to get some alterations that will enhance the playability of your equipment.