Once you hit the Skill Speed of about 1200 ( it was a little over 1k in SB) meld... CRIT CRIT CRIT CRIT. If you can't then go with Determination.
Don't meld Direct Hit. It doesn't scale well with WAR. WAR has alot of guarenteed DHCrits which means you don't gain much for melding DH. Instead you meld Crit because Crit damage actually gets higher the more crit you have on top of randomly getting a crit having a higher chance. Determination is a decent stat that increases their damage and how much you are healed. Don't meld Tenacity... please. Tenacity is just... a fairly useless stat because the scaling is pretty garbage on it.