Not a racing sailor myself but agree with the general consensus that the Jib is best for upwind sailing.
My Centaur has a furling jib so not great reefed beyond a few turns. I pull it as tight as it will go and she tacks through 110 or there abouts, generally need to be running above 3 kns or she stalls.
The main is roller boom reefing so not great when reefed either. Upwind its just to keep lee helm at bay. Still I,m happy to get out there and keep her moving in the right direction.
Its reported that the Centaur designer Laurent Giles recommends the Iron Main for progress to windward, and, unless I,m just messing around, I tend to press the start button.