not sure I understand your grip but if its working go with it. sand shots are different animals .. what creates compression off of turf is ill suited for a sand shot which is more.... as you say scoopy or throwawayish or at the very least cross line . Me personally I think much can be done at address, cross line open face , exposed flange swing as per normal. But the best in the world also vertical hinge a further sophistication or whatever. Shot at hand depending. No shaft lean is important too.
I almost don't look at the ball anymore! Vertical shaft open face in the bunkers with lots of sand, square face in most of our thinly supplied bunkers as I lean forward and RFT before driving my right arm 2" behind the ball. I really have to control the strength of the shot since the ball comes out and rolls!
I experiment with 8 and 9 irons and shorter RFT and drives! An open 8 iron and a nice pop gets the ball about 15-20 feet from where I'm standing and the open 9 iron is a little shorter. RFT is waist high and driven strongly down.
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HP, grant me the serenity to accept what I cannot change, the courage to change what I can, and the wisdom to know the difference. Progress and not perfection is the goal every day!