Have myself a 4.5 Maui sails legend and 100% carbon Maui sails rdm.
Fell for old mistake of thinking "exact mast for sail" stick to rigging dimensions.
Anyway for the past few months the sail was sluggish and lacked power. On sat was blowing 0-28knts. Decided to spend time playing with batterns and tuning sail. Best 30 mins spent. Should have done this 6 months ago and i may have saved myself a walk of shame on a wave session where the wind was there and I was lacking power.
I added 2cm extra down haul and about 5 cm less outhaul. Increased battern tension. This sail was so well balanced and had awesome power. Felt like a 5.3 at least. Rode out gusts and downright sweet. Anyway felt like a dick after months of twitchy poor sailing.
It was so balanced that I had great a
ir control even jumping one handed hooked in for the first times.
Anyway you can teach an old dog new tricks and now I plan to spend 30 mins on each sail (somethiing I will never much up again) and use a permanent pen on sailbag.
After twenty plus years I was just getting too complaisant and trusting the manufacturer. Silly me.
Do the Maui sails come with really explicit rigging instructions? I sail Ezzys, and also got a bit complacent about rigging. Then on one slightly bored working day I watched David Ezzy's comprehensive rigging videos on how best to rig his sails. He's very pedantic about this, but I decided to follow his instructions to the letter next time I rigged up. Result-like you I managed to make the sail handle considerably better, and now I understand his tuning philosophy for different wind strengths pretty well.
Cheers, Jens
Three ways to rig a sail
(1) to exact specs
(2) so it looks how I think it should look
(3) so it feels just right
Normally I try number 1 and number 2, and find number 3 is right in the middle 
BTW h2o: not that I have that much experience on them but I found the Maui wavesails felt better to me (as a heavyweight mind you) on a more constant curve RDM (Ezzy) which flattened out the mid section and twisted off a bit more, and also used at the top of their wind range
