actually.i have a hopefully bigger jet on order. presently the installed jet is a 43. I have a 48 on order. It will be a while. Jet is supposed to arrive next week but we'll be on a trip..sadly- the manual for this model specifys a 43 jet..you'd think that would indicate that something was amiss with this jet. as we're warned not to poke into it..hard to imagibe one could screw it up cause less flow.
UPDATE..I now have a bbq tank and the original regulator rigged up to now bypass EVERYTHING except the burner assembly with the 43 jet..guess what ! same results.
Thanks for all the input/ideas. I'll post results when 48 gets tested.