Curious... Where did the tuck position where a skier holds their arms along their torso, and poles behind them, come from? Is it based in any objective data that it is more efficient? Or a fashion statement? Or a point of compensation for those with poor thoracic flexibility?
Know the tuck you mean. Use it all the time on my regular Canada mountain which is the 1st place I saw it back in 2006 - there's some long, flat commutes.
Subjective opinion is less drag than hanging arms, more drag than a full race tuck. Then again it's far easier on the legs than being in a full tuck which helps a heap into the 2nd minute of tucking, it keeps the hands warmer and the poles held out the back add some rotational inertia for stability.