It's very hard to tell from the video but it looks a little to soft.
I have no idea though on AE shocks, you could tell me you were running a spamwangle in the rears and I would have more of a clue
Either you need to up the oil or change the rear piston to one with smaller holes, whatever that is with AE pistons??
More squat is better for the bumps, so less washers, sorry Chris
This will make the rear slide a little more into the turns though.
Also go fully long on the wheelbase.
I've not had the chance to try mine on grass yet but when I do I will be able to help some more. That looks pretty bumpy there though.
E.