Yes, alot more retro going on here in LA then in OC I'm sure

Ours are probably 50/50 retrofit/new construction.
I was looking at the SI5 tutorial and it recommended the same, use new construction labor times on all the rough in wire, then in a project that is a retrofit adjust the difficulty factor for the rough in phase to something like 150%.
I think this is the way to go. That means I can just use one package for both new construction and retrofit work. The only thing left would be the backboxes in which case I can just assign a generic product with an average cost so we can track how many 1 or 2 gang backboxes are needed for a job. I will probably still use the misc field for things like wire ties, d rings, etc.