been plenty of opinions on this. Mine is shorter and it has it advantages, especially for flipping. The longer ride plate will prove if it can cover all requirements i have of the ski, My mate has a very short one too, with long ride plate and he said he does not have the same issues i had of the ski rotating over the top of you on normal jumps. He flipped it straight away, no problem. His ski is cut past the ride plate bolts too. Our other mate has his cut to just before the ride plate bolts and said this is all you need. Not shorter. However, none of us have really ridden each other ski, so it's a matter of opinion. ( Gee that helps!)
So really, it's still up the air. Depends on rider style I would say. If you go really big, Like 5 to 6 seconds in the air, the longer rear or extended ride plate will be required it will keep those high speed take offs under more control and stop the ski rotating back on you.
If you ride smaller surf and jump around 3 second airtime. shorter for sure. and you can add longer ride plate if needed.
Mine has the angled rear with normal height deck, the other two have a lowered deck with a flat rear. a lot less surface area than a stock rear, so its ok.