That's an odd affliction, John. At least, it's the first time I've heard of it.
Although, come to think of it, I have a perhaps related condition. For me, it's a tendency to play too fast. Perhaps channeling the late Keith Emerson (I wish!). Then I have to force myself to slow down when it comes time to record.
The way I combat that propensity is to start every recording with a click track, over which I record a disposable guide track. Then I copy my little test tune over to my pocket player, wait a day, and then listen to it away from the studio. If it feels rushed, it's easy to slow it down (being a purely MIDI concoction at that point) and listen again. I don't know why guitarists and keyboardists think click tracks are just for drummers.
However, I would
never adjust the tempo of an
audio recording. If you suspect that stretching and compressing time negatively affects audio quality, you'd be right. 2.5% is probably safe, but I still wouldn't do it.