heres what i do for turbines/reactor setups:
1) find a temperature that the reactor stays stable at while feeding the turbines steam. this will take fiddling of the control rods percentage until the reactor stays at a reasonable temperature to keep the steam cycle going. you can take it down to 600+ degrees and keep a few turbines going. this depends much on your rod/cooling configuration. with 10 turbines, i keep my rods at 50-60% and it stays stable at 600 degrees, with a fairly low fuel consumption rate. i think my reactor is 9x9x15, with 9 control rods in a checker board formation with liquid ender between the walls and rods, and between the rods themselves.
2) turbines should be set to max mb/t (2k). as they spin up, they will consume more steam until it reaches this limit. vents set to dump excess fluids.
3) use tesseracts to transport water from turbines back to reactor, and tesseracts to transport steam from reactor to turbines. you dont need multiple ports. one input/output per turbine is enough, and you only need 1 in/out on the reactor to feed all turbines. *NO PIPES* there is no pipe in the game that can keep up with the flow rates. just use tesseracts.
4) if your running the latest version of BR, you can 'throttle' the turbines by engaging/disengaging the coils. when disengaged, the turbine spins up much faster, perfect for when you are tweaking the turbines and breaking the multiblock makes the turbine reset to 0. you can use a computer to regulate this afterward and keep the rpm's stable around 1800. this highly depends on the type of coil, how many coil blocks, and your rotor setup. i use 5 rows of enderium, and a stack of 10 fans, 8 blades per fan (each blade is 2 blocks long)
with one reactor, i can spin up 10 of these turbines and once the water/steam loop is sustained, disconnect the water supply and they keep going all day long. as long as yellorium flows in, it will keep running indefinitely
