I'm new to this site but you and I are in similar situations. I too have an ascending aortic aneurysm the same size as yours. I was diagnosed 2 years ago at 4.24cm and it was at 4.37 6 months ago. I go for my next CT next week and will see what if anything has developed. I'm suspicious that I will have some growth. My BP has been well under control (around 110/65) since the diagnosis 2 years ago until about 5 moths ago. For some reason it has been quite a bit higher lately, between 120/80 and 150/95. For the past month or so I've been having dull pain in and around my sternum and I'm very short of breath. I'll take a shot at your questions....
1. No physical activities that could result in getting hit pretty hard. I've heard a lot of different things about lifting weights but my doc told me to keep the weight less than 30lbs. I do more reps with less weight. Any mild cardio is good and suggested. Check into the golf issue. I have heard that a big golf swing could be bad for folks in our situation. Avoid Valsalva maneuvers (google it).
2. Important to keep the heart rate moderate as possible. If you are on a beta blocker, and you should be, it probably won't get much past 80. Definitely check with your cardio doc
3. They tell me <120 systolic is best. I feel best when I'm at around 110, no light headedness and not much pressure on the aorta.
I have no knowledge of Dr Bruce but if he is a cardio at Mayo, I'd feel pretty good about that. I've got a second opinion scheduled late Feb with Dr Christiano Caldiera at Tampa General. I hope to get some real direction from him. Best to you John and I look forward to comparing notes with you as we travel this road.