Bobcat ,

Reduce rotation reaching w/ the kite ? - NEVER !

Think in terms of apparent wind - the kite (and it's big luff curve), proceed the mainsail INTO the wind when reaching ! Mainsail profile gains (reduced drag), are small because the fullness of the main's luff is behind the kite as the boat reaches downhill . That is until ...

... you hit a big wave or shoot a fast gybe while reaching w/ the kite. At the instant the apparent wind swings astern you'll feel the rig of the boat "load up" substantially as all that force (has anyone calculated the N's of force at this moment ? - gotta be huge!!), from the true wind slams into the sails from astern. If you've derotated by 10 degrees you've reduced the masts ability to elastically absorb the sudden load (by 11% ?) because the mast won't bend off as well in this profile. So, where does the sudden load go ? Into the sails (bad) and bows ( bad/slow/wet)... Also , when masts bend they get shorter base to tip. Derotating reduces the diamonds effectiveness to keep the mast below the shrouds from shrinking too much ( bad/ dangerous/expensive ).