What Joe said. Use the pump for the entire batch and make a balance line between the two tanks. Using head pressure to drive the filtration process lowers the pressure of the clear beer (obviously), and will cause foam breakout at the new lower pressure that will likely be below CO2 saturation pressure. And again I will advocate the use of VFDs to control pumping speed. Throttling a valve after a pump is another way of inducing foam. Treating your beer gently under pressure will result in better foam formation and retention. Good luck.
Phillip Kelm--Palau Brewing Company Manager
and Worldwide Brewery Installations