CMC said...
The point to the curve towards your palm other than just comfort to your palm is that as your top comes down and across your body as you untwist and pull yourself towards the paddle the curved t-piece allows the palm of your hand to have a more relaxed angle to the top of the paddle and blade direction. If you are using a flat surface this twists your wrist and breaks the power of the stroke for you to keep any hold to the t-piece.
This is hard to explain and unless you are keeping your paddle vertical throughout the stroke on both planes for as long as possible probably not an issue anyway.
i'm with cmc and gorgo on this one. i can't see you getting a good release from the water with handle backwards. the handle almost rolls in the palm of your hand as you 'flick' the paddle out of the water. it's not going to roll that well with bends into your palm. personally, if i have to grip the handle with my fingers- i'm doing it wrong.that flicking action combines with a swing of the paddle to the next stroke. however if you are more 'lifting' the paddle out of the water and are happy with that, then i don't think the handle position would be a factor
cheers