I did not get the flow restrictions with mine. I planned on running 1/4" lines or hoses like the loader cylinders have installed on them, I didn't think I wanted it any slower than the bucket was.
I think it worked out good, I like the speed it opens and closes when I'm grabbing something in the bucket, when I'm going from fully open or fully closed it could be a bit faster I think but it's not bad. Maybe with 3/8 hoses it might but probably still wouldn't be too fast though a 3200 may be pumping a bit more than my 2620. I would think you can always add them if you think you need them later..
Either way I bet your going to enjoy having the thumb, I do.