At this point, I'll be happy if the KDF side DOFF system ever gets a way to score tier 3 or 4 in a CXP category. At the present rate, I don't expect many (if any) Klingon characters on Tribble will be able to score the highest DOFF testing reward.
Then again, I'm not even sure Diplomacy counts on the Fed side, in which case it's just as bad there.
By my knowledge you only need to get the commendation up to tier 3 on either side. It was nowhere mentioned that you need to do it for both the Klingons and the feds. This wouldn't make sense either since the Klingons opened up a week later and started with a big disadvantage.
It was already stated by Heretic that the diplomacy commendation will count. It was also stated that once it gets reworked you keep the same tier you have achieved at that moment.
It doesn't hurt to get a 2nd commendation up to tier 3 though, so that's what I'm currently working on. My diplomacy will hit tier 4 tomorrow or the day after (going for t4 for the ds9 transwarp reward and because it was easy to do so with the doff system) and I'm also working on medical exp, which is at about 17k/50k now. I don't expect to hit the 50k though, but Heretic already said that the amount required for t3 and t4 will get lowered. I don't know if currently gained exp will stay unaffected, but we'll find out about that in several days from now with the patch update.
What always makes me laugh and cringe at the same time is people that go into a test server looking to make out like they had a contract for $. Please people - its a test server and we volinteer to help find bugs and try to break things.
Cryptic like any over developer I have ever beta tested for - "always" gives the folks that stuck it out and helped something in the endl. Be it ingame gear or a free copy of the game b4 launch. Something I have pondered often is why anyone would help out on a test server of an established game if they did not have a passion for the game and desired to have a chance of verbal input to help influence the outcome of something that they cared about.
I could go on and on but bottom line - if you do not have a desire to volinteer and do not enjoy yourself (at least most the time) don't bother jumping on any test server. And please don't come onto the forums for said test servers and whine about it.