Two Big Fat 3mm pencil jets demolishes fans and rinse bars, you get a big heavy stream of water with 3mm pencils, making it quicker to rinse bits down the glass.
I found fan jets really frustrating in that the weight of the water falling down the glass made it take ages to rinse the bits of dirt down the glass. Whereas the 3mm jets create a heavy Flow similar to a stream of water.
I use the pump on full wack.