The footrocket is not a very good hull for flatwater.. it shows now that you're riding a dvx.
If you pull the bars to your chest once you're in the air and spot the landing and then extend out/reset when you land for each flip, they will become a lot more consistent and you'll be able to rotate that little extra so that the nose doesn't scoop too much water and slow your drive down. the motion almost feels like you're rowing a boat with two oars sitting backwards.
Here's my 6 in a row over the weekend on a dasa 1200 xfs rickter:
Short space allows for 8-9 but i get dizzy and I have to run on stage after it and I tripped once so now I keep it to 5 or 6 clean ones.
I'd also like to add in my experience that no trim is not the answer to extra height. No trim means you still have to pull hard on the ski to make it rotate. I find more height with trim and hardly any pull, almost looking forwards off the lip. this allows the ski to drive up without you pulling back on the bars.