V G wrote:

 > On the power and ground nets, I can go 0.03" trace, 0.02" clearance max,
 > before things start getting unroutable.

You do need need any extra spacing - 8 thou is enough.
What we used to do (on mainly TTL boards) was to route the power rails=20
first so they took up the obvious direct routes.
I don't know your CAD program but the power/ground thicker tracks should=20
go just past an SMD pad then neck down to say 10 thou to the pad to=20
prevent uneven soldering. With the CAD package we used this was often a=20
manual operation.

George Smith
--=20
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