2 microturbines should be enough to run the extractor at 1 operation per tick for all 4 stages, without switching. That's not 15 seconds per ore, but for rare ores about half a second. 2 MTs should be running your extractor about 30 times faster than you need atm.
I'm with you up until the no switching claim. Stage 1 requires 512Nm of torque so 4,194,304W at 512Nm of torque means our maximum rotational speed for stage 1 is then 8,192 rad/s.
Using the equations from: http://rotarycraft.wikia.com/wiki/Extractor
stage 1's operation time in ticks would be 900 - 60(log2(8,192) = 900 - 60(13) = 120 ticks = 6 seconds. The minimum speed required to run stage 1 at 1 operation/tick is 32,768 rad/s so we need 4x the power just to get stage 1 down to 1 op/t.
The 1op/tick speed of the stages are as follows:
Stage........Speed
1...............32,768 rad/s
2...............1,048,576 rad/s
3...............1,048,576 rad/s
4...............32,768 rad/s
Which is why it takes me 536MW to run all 4 stages at 1op/tick without switching and this is indeed the minimum required to do that.
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