I have Bradycardia as well and I've never done cardio. Doc says it's due to my lifestyle and workout regimen. No worries.
Your temp is fine. No one is perfect there. It's normal to range a bit. Many things influence this - thyroid, pituitary, adrenals.....
DHEA's good stuff, if you need it. I never say it lower cortisol much, shbg a little. Remember though your body will shunt it where it feels it needs it.

https://www.ncbi.nlm.nih.gov/pubmed/9876338

I've taken it more so than not, although I've never felt a difference either way.