Sorry to disagree but I have both Boosters and Tempo (in different sizes) Bottom end performance in sails is negligible. Booster (probably) more stable top end and harder rotation/handling.
Examinining sails they areidentical apart from the extra camber.
Tempo would be a good sail for that board.
In much bigger sizes Booaster might prove more stable (over 8.5 IMO) but upto 8 ish you wont tell difference.