Low,
Thanks for coming in. Here's a flow table performed by RC Engineering for the LS3 pump at the outlet of the module. Bryan is running the complete module in the car. A bit of re-scaling is needed to adjust the BSFC accordingly.
At the same time ZL1 and CTS-V fuel modules were also flow tested. The results for the CTS-V are very similar to those obtained by Kinsler for a CTS-V fuel module, so the flow numbers should be good.
One part of the equation that may be missing in yours is the fuel draw required to drive the venturi pumps in the fuel module. If you are taking the flow readings from the outlet of the pump instead of the hat outlet then your flowrates will be higher. Did you remove the pump from the manifold housing for testing?
I was looking at your DW300 last week for a potential project. It's a heck of a pump. Very efficient and nicely packaged.