The biggest thing to improve SNAP accuracy is to ensure stability of your tire pressure, and then to ensure doing a roll-down about 15-minutes in (also, try doing a Wahoo Advanced roll-down as Wahoo suggested).
The biggest thing to improve SNAP accuracy is to ensure stability of your tire pressure, and then to ensure doing a roll-down about 15-minutes in (also, try doing a Wahoo Advanced roll-down as Wahoo suggested).