I've got a Hurricane and two M-20s. I'm at 20 PSI on my concentrator rig and I'm pushing a Cuda to the max. I back down on my M-20s because it's more than I need. I run those two at about 4 or 5 LPM each... You can rage on concentrators... just have to get the higher PSI models. 
Bigger torches really do like/need more pressure.
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"Truth is, everybody is going to hurt you; you just gotta find the ones worth suffering for." -Bob Marley
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