Have you tried getting a report from the doctor doing your cardiovascular report to state to your AME and the CAA that given your height/weight/body composition you are clearly at a low risk level for cardiovascular disease and as such in their expert medical opinion these hoops you have to jump through are an unnecessary and expensive waste of time?
I had a temporary medical problem that took 2 weeks to get back to full fitness but 6 months to resolve with the CAA, and the doctor at the CAA dealing with all the correspondence was a neurologist by trade (brain/spinal/nerve specialist). The medical problem I had was absolutely nothing to do with any of that. In fact, potentially the last time he may have dealt with the area of the body in question was possibly in medical school.
So I did a bit of my own research and spelled out in black and white, quoting a couple of medical references, why the problem I had was not a problem, and the fact that his continuous insistence on regular blood tests was unnecessary because by the very nature of the human body and the endocrine system, those results would be expected to significantly vary over a short space of time (i.e. you would expect 8 significantly different results if you get a blood test every week for 2 months, even in a completely healthy person) and that was not an indication of any abnormality whatsoever.
The next time I received a letter from him three weeks later it had my new medical certificate in with a possibly sarcastic "thank you for your correspondence".
Challenging the AME/CAA with evidence will do you no harm as long as you don't piss them off