really beautiful system man. Very clean.
I'm planning my own system now and trying to make sense of this Low/High pressure deal. I'm looking forward to hearing how it goes with the drilled out orifice. I've spent the better part of the day trying to make sense out of this plumbing stuff and it's making me go cross-eyed. Looks like you've made sense of this so tell me if I get it; you're running at Low pressure so you can use those valves and pilots, but the burners are high pressure burners (right?) so you modified them by drilling out the orifice to get better performance. So are low pressure burners actually any different from high pressure burners, or is it just the orifice, and if so, can't you just buy the "stock" orifice?
Again, congrats on a beautiful system!