Aye, on my GTT Cricket I keep the natural gas really low compared to the oxygen.
Like 25% of the oxygen.
Maybe you are lighting the fuel first and then bring up the oxygen to go for the flame chemistry you want but you reach the maximum available oxygen before you get there.
My thought is to light the fuel then turn it down as low as you possibly can before bringing up the oxygen.
If you can't get the neutral flame you are after then you are going to have to hunt up a 10LPM oxycon or go to tanked O2.
Good Luck with it.
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