I'm at 9800', posted the same question last year. Big difference in our elevation. Built an efficient forge, 350 cu in, 1" Chile Forge burner, no where near forge welding temps. Consulted a long time farrier/black smith who lives at 8200' here in Colorado. He uses a three burner small forge for his mobile farrier work, coal at his home for his blacksmith business. He suggested I go to coal. Not wanting to use coal, I recently built a ribbon burner. Still not quite there with the 2 1/2" Blacksmithdepot blower. Believe the problem is the lack of pressure from the blower. According to my WC gauge only getting .5". Have a blower on its way that claims a WC of 6", see what that does.