Water Feature Pump Size

Hey Guys,
Well finally got water in the new pool , hopefully all the equip will be up and running
by this week.
I connected the Pool water feature which is 2200mm Wide and 1800mm above the water line
it is a stainless steel spillway that I only wanted to trickle down the feature wall.

It runs on a Hayward super 11 316 pump 1 1/4, the flow seams to be to fast as it is not trickling

Can anyone suggest what size pump I should be using.