Increasing accuracy of Puck.light()

I'm also doing analogWrite(LED1, xxx) elsewhere in my code, if that makes a difference.

Ahh, you didn't mention that bit ;) Just normal analogWrite, or the forced software version?

Did you experiment with different timeouts? I'm not sure how I feel about this - making Puck.light 10 times slower just to deal with the very first reading in the case where someone is using analogWrite and Puck.light may not actually be in most people's best interests :)