My heart rate doesn't increase either. I'm generally in bigeminy or trigeminy with about 20-25 thousand pvc's per day and my pulse is usually in the 50-60bpm range. Sometimes my blood pressure will drop while walking up the stairs or doing light physical activity and that's usually when my pulse will kick in a little around the 70-90bpm range. Strangely enough I have to lay down to get my blood pressure to go back up. I was wondering about low pulse rate too.
Your experience is the same as mine, in general.
However, if I am having a panic attack (I get them sometimes), my heart speeds up and the number of PVCs increases as well until I calm down. There is a huuuge association between fear/anxiety and the production of PVCs. This is usually attributed to having a lot of adrenaline coursing through the blood stream.
But on the other hand, quite a few people here note that they have *more* PVCs when they are at rest and their heart rate is lower. That's due to a different mechanism related to the natural pause between heartbeats.