increasing performance

As a winter project I have brought my fuselage home to fix it up
alittle and
re-finish it . My question is, just how much time I should spend
contouring, smoothing ect. as to not be wasting my time and money vs.
getting another L/D for my trouble? It's in pretty good conditon, a
bit of peeling paint(automotive), the right/front side of the canopy
sticks up about 3/16", alittle wavyness overall in the fibre glass,
and some dents in the fairing behind the main wheel (non-retractable).
The contruction is of fibre glass so do I need
to sand it right down, prime and paint or take the easy rout and sand
the bad spots, about 10% of the body, prime(?) and paint? I have also
read that the area where the wing meets the fuselage is quite
important, reduction of drag.
The wing root sticks out about 4" from the fuselage so should I mount
the wings and fair the two together or just leave it ? The performance
is between
30-33:1 with a wing profile similar to a 1-26 ( turbulant flow ?) so
will it really matter? She flies well but since I'm going to do some
work on her
anyway I figure I'd do some little mod's while I'm at it, if it would
be worth the time. I have re-finished the wings already so they are
not at issue.
Any suggestions would be appreciated.

Thanks, Don