I'm currently running 5 max size HP boilers and have notice a max of about 300 mb/t on 1 input face of the consumer. Given the I use a setup of 1 mj producer, 1 energy bridge, and 5 steam consumers with all available faces of each consumer with a steam pipe on it. I currently have 6 such setups in parallel with each other to charge me bank of 46 Redstone energy cells. Ya my setup is over kill but I have yet to have power issues even with 3 laser drills running off it.
Let me clarify a few things for you
A 36 HP bouler produces enough steam to generate 144 mj/t, you have 5 boilers meaning that you generate 144 * 5 = 720 mj/t. 3 laser drills require 4 pre chargers each, each pre chargers requires 100mj/t to run at maximum capacity, this means you need 3 * 4 * 100 = 1200 mj/t to have your laser drills running at maximum capacity.
Now TE's energy grid is kind of smart in that it devides all available power equally amongst the power requesters. So if you would produce 100 mj/t and have one machine require 50 mj/t and another require 100 mj/t they would both get 50 mj/t. Add in a pulverizer at 4 mj/t and the other two machines would both get 48 mj/t. So you should indeed never run into power troubles.
Considering you say you are charing your redstone energy cells I think its save to say you do not have your laser drill prechargers connected properly
Remember, a redstone cell can only ouput 100 mj/t!