If you use EnderIO, try the Transceivers for getting steam into the turbines. There doesn't seem to be a limit, how much steam goes through a Transceiver face. (There does seems to be a rather sharp limit though, how much steam will go through a Liquid Conduit node.)
Steam Boiler -> Liquid Conduits -> Transceiver
Transceiver -> Turbine
Steam Boiler -> Liquid Conduits -> Transceiver
Transceiver -> Turbine