Those sound like good duel settings, though personally I prefer quicker duels.
I set my g_saberdamagescale to "2" because I primarily play other game modes than duel, and it works well.
seta d_saberGhoul2Collision "0"
Intriguing... I used 1 (default?) and assumed that was supposed to make better collision, but I still ocassionally had people whine that they "hit me" and it didn't register or something.
Perhaps I should try the other one?
Another option you might try for duels is g_sabertracesaberfirst 1 (0 for non duels) which increases blocking.
Turning off location based damage like you did means that body shots, limb shots and head shots all do the same damage (as much as body shots did in the regular game).
With it on, headshots do the most damage, body shots less, and limb shots the least.
The boxtracesize I haven't messed with (it's set on whatever the default is). Is that related to blocking or attacking?