If I wrote the code, one rule I'd change would be the deduction for stepping out of bounds. As long as a tumbling pass is executed well and the movements are well-controlled, why penalize a gymnast for stepping a few inches further?
I'd much rather see a controlled step out of bounds than a clumsy struggle to stay in the blue. And truly, taller gymnasts are automatically at a disadvantage. A double layout is going to cover more distance when you're 5'6" than when you're 4'9". If a step out of bounds happens with lack of control or a fall, there will be a deduction anyway. And that's what should separate the best gymnasts from the lesser competitors, not the location of their feet.