I wouldnt worry, if your a very good dd, and your being outdone by your ls drks, thats a good sign because it means they are also good :D 2 good dd > 1 good dd. Now with that said, even with MS its still close for that '25%' because drk also has a 1hr lol. A wise drk will abuse your warcry timer also with his 1hr :D
Most drks that get aww strucked by a war during MS its because they forgot they also have a very powerful 1hr. You basically swing for 1k tp a swing with it, or better to say, you have a 2hit build haha. I love seeing a 70k~ reso (50k is more realistic at 1k warcry), but my drk will have 1k tp more in that same time frame, so it balances out quickly. When we can ws more frequent for a little less max dmg. I havent been out dd yet by a war (current state), but that doesnt mean I couldnt - they def have a potential to compete. The issue lies in the fact that they buff my dps more than they do theirs during warcry due to having a faster avg ws, thus drk making more of the warcry buff. So I love war in my pty as a dd, I think most other jobs feel the same way.
This is wars reason though they warrant a DD spot so dont be worry. While you may only provide the best dps in the game for 30 sec per hour, thats still great and a good enough reason to bring a war to any hard zerg fight. Add to that the potent pty buffs of warcry and brazen... and the fact every fight you should have a revitalizer... well war can add alot of dps for others. This is cool and something a drk doesnt do as nicely (just can give huge -stats to mob).
A good party is one with multiple types of DD's not just a one glove fits all. I love to have war and drg with my drk, because warcry+angon just melts stuff, thfs are nice because the TA ws's allows me to not have to hold back as much, sam are cool bc I can sc super easy with them, blu for the MG and -def spells, rdm melee bc then im sure to have haste2 for 9mins+ :D same for a melee cor (rolls are amazing), dnc (steps etc can be cool addition), etc. Any player will add something cool on any job if they know wtf theya re doing. Yes, even mnk! Chi blast and mantra are cool, I like riding 3000 hp base and I am sure others dds do too for fights because a dead dd, does no dmg and theres alot of moves that do 2k~ hp which will kill most damaged dds. The question is always the same though, will x-job add enough benefit to bring? Cor is a clear yes, mnk a softer no lol. The rest kinda fall in between, but still overly useful and wars at the top.