What city are you in?
I've got a 10lpm, 20psi oxycon that I worked on myself. Runs a Minor very well(I had the same setup), I got oxygen purity to 94.7% on my meter. Bought a Phantom and built an HVLP so don't use it anymore.
To answer your question, a higher psi equates to higher mass flow which means more oxygen molecules and a hotter(or bigger) flame.
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Bobcat on 15lpm and Phantom on HVLP
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