I sat out nearly 35 years. When I came back, I was still able to fly the entire pattern at perhaps mid to high advanced level. I took the opportunity to get rid of a bunch of bad habits that I got away with when I had hair. I completely changed my stance, arm position and handle grip along the lines of what I read and saw here. Brett Buck and Ted Fancher's postings and video allowed me to regain close where I left off but do it by forming new muscle memory that works and will eventually let me go further than where I was.
Specifically, I had the same issues you are having. Motorman is right. In general open up your corners and learn to fly through them. You couldn't do that with the Fox 35 but today's power is soooo much better. Sit back and enjoy! What changed for me was dumping the bias in the handle and adjusting my arm position to put the handle vertical. This gives you full control both ways with just finger pressure and wrist. Get your shapes back first. Don't worry too much about the size of things till you get the shapes back. I would not move the bottoms up to keep the size. It may just be me but I do not fly well if I am not holding the bottoms at around 5'. One habit I had to break was leading the plane (whipping) into maneuvers to build up momentum and not getting planted before starting a maneuver. You couldn't stop and face where you wanted the maneuver to be and let the plane fly into it with the old stuff.
I am a huge fan of Video but I do it differently. I record from the side so that I can see the plane head on in maneuvers and even more important I can see the pilot (me) from the side instead of a back shot. When I watch the top fliers I watch them, how soon they plant, where they are looking, what their arms are doing, and not the plane. I learned a lot doing that.
Welcome back!
Ken