I’ve gone thru something similar recently and understand your line of questioning. As for #1 - yes find a well respected cardiologist and a sports oriented one if possible. I ended up in a cardiologist office after some iffy scans then an abnormal ECG (AV block). All 4 chambers have enlarged - he was honest that their practice doesn’t see a lot of ‘athletes’. Suggested cutting back 30% of volume to minimize more enlargement. Seems kind of random to me and I’ll get to a sports cardio soon. I have cut way back BUT the conversation also turned to the value of aerobic exercise and to not stop completely. There’s a delicate balance to achieve here. I asked him about Z2 vs Z4/5 and his statement was that the heart impact going from brisk walking to Z2 is greater than the impact of Z2 to Z4/5. So focus on volume reduction more than intensity reduction was the guidance - again that’s my situation and one doctor - obviously not advice for ANYONE else. I’m personally curious to know what you find out.
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