Also, pump I use is a Dolphin Ampmaster 3000
After a 3000GPH pass's through the elbows of the PVC + head pressure, Ultima II + and Ocean clear cannister this will decrease incredibly. IMO, a turnover flowrate of at least 4-5 times is sufficient for Fish that produce a high bio load.
In the end it will come down to the type of fish kept and the amount of feeding you plan to do. You don't want to over feed where your bio (filtration) cannot compensate resulting with problems with your water parameters.
With having two prized BArra's in that tank. I would rather over filtrate than to have your system crash because the lack of.