I experienced the same confusion trying to run a mirage off concentrators. The problem is that everyone has a different idea of what an acceptable flame is.
The minimums discussed by soft glass artists are generally enough to run 1/4"-3/8" outer fire candles. IMO if you can't run 3/4" candles in a clean/slightly oxidizing flame you aren't fully supplying the torch.
At concentrator pressures you can only push about 8-10LPM through a lynx, you need more pressure to achieve higher flow.
You can always start with the two concentrators and make a change later. I was initialaly running my Mirage on 30LPM of concentrators but added a compressor/storage setup later which solved everything. Its like working off a tank.
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GTT Mirage, GTT Lynx, Smith's Little Torch
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