Anyone recommend the best and quietest 120mm fans to use for my CM Stacker's side panel?

At the moment I'm using (3x) 120mm AK-183-L2B Akasa Amber Case Fan, but it isn't adequately cooling the NB or MB as much as I would like; my Sharkoon seated on the Thermalright must be sucking all the air being pushed in before my side fans get a chance to cool the MB because of the CFM imbalance.
The Sharkoon is 2000 RPM 76.3 CFM where-as the Akasa is 1400 RPM 44.8 CFM.