Seems to me that you're using too much input power. According to the equations on this page* (http://rotarycraft.wikia.com/wiki/Extractor) I believe that the maximum speed for each stage is achieved at 32k r/s, 1M r/s, 1M r/s, and 64 32k r/s respectively. Using more torque than required for a particular action in RotaryCraft will not speed up the action. Using those speeds and the minimum torque requirements shows that stage 1 is the most power-hungry at 16MW. One gas turbine produces 64MW, I can't imagine you need four of them. I shared information about my extractor setup here: http://forum.feed-the-beast.com/threads/against-the-ropes-rr-vs-monster.44300/page-2#post-611693 *If the information on the wiki that I linked to is incorrect I apologize. I see that @Reika has some posts on that wiki but I don't know if that means that the wiki information is correct or not.