With a concentrator, I think Bobcat, Cricket, Alpha, Minor. I am not sure any of those are really a step up from a mini cc though. If you are running 1 5lpm concentrator, you will not see much different on any torch from the mini. Maybe consider adding another concentrator, or jumping up to a 10 or 15? I do not love my Lynx on a concentrator, and I run it on my M15. I think it needs tanked to really get the most out of it.
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Kathy
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