Re: B/P and percieved level of exertion
I am surprised that you exercise better on beta blockers. NOrmall doctors won't give them to athletes as they hold the heart rate down. I run and my doctor has me on irbesarten which is an angiotensin II inhibitor (I think). OTher types of Ca channel blockers etc which also alter blood circulation to the periphery are no good, they make your legs feel like lead.
But to answer your other question, I have a friend who is also a runner and she had extremely high BP. It did affect her running and once they got it under control she was heaps better. But hers was astronomical like 200/110 sort of material. And she was so tiny - not your typical candidate for BP. For me, its made no difference at all, but mine was only ever borderline like 140/90.