Listen, I didn't mean for this to turn in to discussion about fluid dynamics, nor is this something the OP should go nuts over. All I was saying was that the difference in tubing diameter AFTER the regulator MAY cause an issue. Just thought it was something to keep in mind should he have issues with setting float level, flooding or a rich condition. Since he is setting the pressure at point A then stepping down at point B, he may (or may not) see an unwanted difference in pressure, however much it may be. I am not an engineer though so all of this is conjecture on my part.
And again, this setup will likely work fine but it's not the optimal way to go about it. If it were me, I'd ditch the -10 stuff and start from scratch. Like myself and just about everyone else who replied here has said, it sounds like a pretty mild setup and there is no way in the world a -10 delivery line would be remotely necessary.
Only other thing I would add here is that cobbling things together like this just because 'it's there already' sometimes causes more headaches than just starting from a better point.
