Well seeing as the bonus's from Fencer transfer to weapon skills, it would be a good trait to give RDM at the same levels as WAR gets.

Fencer V at 99 is
+9% Crit +55 TP

Couple this with giving RDM all the EX sword weapon skills and us having CDC and it's not a bad setup. Still loses to DW builds but at least it can hold it's own when your not /NIN or /DNC.