In your case, I don’t think your low blood pressure is adversely affecting your blood sugars as it is the normal state for your body to be in. In the case of someone that just donated blood, the drop in blood volume (and pressure) is unusual and the body takes corrective action (via the glucose raising stress hormones). Unfortunately, for diabetics, there is no insulin(or not enough insulin) to counteract the rise in blood sugar caused by these hormones, so an event like exercise or giving blood raises blood sugars substantially (similarly, in people without diabetes, the blood sugar goes up to stressful stimuli, but not to the extent ours does) Keep up the good work, a low blood pressure is definitely working in your favor to prevent complications.
As for exercise, what I’ve tried to do is do a small bolus after exercise based on how my sugar goes up. You can try the same thing; for example if you tested at 100 after exercise, don’t eat anything and test in an hour and a half or two hours after the end of exercise. If sugar went up to 170, apply your correction bolus to lower it. Then next time you exercise, use the same small correction bolus right after exercise to compensate. Remember to be really careful ( and maybe even apply a smaller bolus than necessary) as different exercises and different levels of activity (a great cardio workout vs. a slower paced resistance training one) will impact your sugars differently. Be sure to test regularly. Hopefully this helps, let me know if it does!
Remember, I’m not a doctor (yet lol) so always use your own common sense if something I say seems off