Congrats on the comeback. I also started playing again after not touching my horn for 7 years. Definately take it slow at first, 15 minutes at a time MAX. My first few days back my tone was shaky and my range was horrible. By the end of my first week I was more steady and could crack a high C. After three weeks I am on a solid high D and smooth and steady and can play for almost 45 minutes full range without fatigue. My embouchure was never "text book" but it always worked for me. I have alot more upper lip than lower lip in the mouthpiece and was always criticised for it by my teachers.