Several years ago, I read on the Dr. Weil website to take CoQ10 (100 mg a day) when I was on a statin drug for cholesterol, because it's good for the muscles. Muscles can be affected, in some people, when taking a statin, and the heart is, of course, a muscle. Anyway, I've taken COQ10 for years, even after I was able to go off the statin drug. (I lost a lot of weight and my cholesterol came down a lot.
My resting heart rate now is still the same as it always was (about 76 to 78 beats a minute). If I'm having some PVCs, the heart rate is sometimes different, though. So maybe the CoQ10 only affects some people? Never hurts to get your doctor's take on it, though, I guess.
Interesting, and it seems you get a higher, but not dangerous, HR from Coenzyme q10 (which I know nothing about). That it also lowers you BP my be normal, that is a higher HR for a given activity level may mean you need less pressure to get the needed oxygen to your muscles. That said, I believe both BP and HR go up when one increasing physical activity, so I noted your case was for the same physical activity level.
Where's the O3 coming from, fish oil? Is the q10 a joint remedy?
You may need to discuss the high BP with a doctor, but I think you have the evidence in hand that the q10 is causing an elevated HR... not dangerous, I think, but not the best of results either.