Agreed SR and PC - I often occupy myself working out random mathematical computations - eg I remember my average pace a few kilometres back was so much my average pace now is whatever, how fast does that mean I have run the last few kilometres - very sad, but I bet I'm not alone!
I am running along at, say, 5min per kilometre pace. I decide to go a bit faster, say 4m30s per kilometre. Have I increased my pace or reduced it? I have certainly increased my speed but my the measure of my pace is now a smaller number. But if I say I have reduced my pace most people would understand me to have slowed down. Perhaps the answer is to say my pace has quickened.