Why do you need to be level 30 for the DLC? Level 20 should be plenty to complete all missions and strikes, and level 28 or 29 is probably enough to even run the new raid if you get the opportunity. The DLC has new armor that will get you to lvl 32 and so most likely also has armor to get you to lvl 30. You probably won't get very far if you have raid matchmaking with people who have never been through it before. I'm all for raid matchmaking, but the reality is that you need at least 1 vet that can explain how the raid works and everyone needs to follow instructions or do what they are told. Raids are not like anything else in the game - the entire team will automatically die (wipe) if one person does something that they shouldn't (i.e. not kill an oracle, get seen by a gorgon, drop the relic, etc.). The only way to know what you should or shouldn't do is to have a raid guide or to have been through it before, or at the very least understand all of the mechanics. You could be doing everything perfect and then just drop over dead because of one person - this happens even in experienced groups.