This might be know to a lot of people but a very neat trick when you want to controle the flow into a certain machine you can use one of the many GT pipes as a flow restrictor. This becomes extremly relevent especially when you want to controle large flows of fluids into the large turbine. The way the output hatch works with the large heat exchanger (and most likely the GT boilers) is that it fills them in a certain order and they automatically output as much as they can into adjecent fluid inventories.
So the only thing you need to do to get an exact amount of steam to a specific rotor is to find a pipe that has the exact same maximal flowrate as the nominal flow rate of the turbine. once it sends the nominal amount to the first turbine it will then fill upp the hatch and move on to the second hatch where you do the same again. The only thing you need to regulate in the large heat exchanger is the flow of lava which can easily be done with an IC2 flow controler so that you do not produce more superheated steam than all of your output pipes can handle as it then starts voiding the excess (and distilled water starts dissapearing).
So the key to controling flow rates in GT is to utilize the auto output function of multiple hatches and regulate the flowrate with one of the many GT pipes that are available
Just out of curiosity, how much do you guys play per day? I can usually only squeze in an hour or two during the week and something like 5-10 hours every second weekend. This is the main reason why i didn't resett for 3.2 since progress is so slow for me