Same as you do - and ShallowRio did a series of post on box call use here that you may find helpful. Go back a few pages.

The other thing I did not see mentioned is I also use the pressure of my thumb on the holding hand (opposite the hand that uses the striker) as a tuning agnet. That is as I call I can slide my thumb up and down the side of the box to quiet and chang the pitch....

I hold mine with my left hand the pivot point facing down and the paddle held between my index and middle finger.

JW