It would make a difference, but I think it would still take a (very) long time to do what you want to do in boro. Can you use the tanked oxygen for both the inner and outer rings with a Y connector? Then you wouldn't need the concentrator.
I think if you post your question in the "TORCH" section, at the top of the page on Tips, Techniques, you'll get more answers from people who have a setup similar to yours.
Good luck!
Mimi
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