Spud, I think 30 can be great, or it can not be any where near close enough. I agree with you that candidates have been appointed with lower scores than that. None that I know of from our area though. I know I repeat myself all the time on this matter on this forum (maybe its senility-I am getting old), but you are compared to your geographical area-until you get to NWL (and I really have no clue how many make it off the NWL)
When my son had a 32 composite his FFR (USMA) told him to take them again. He was not subtle about it. My son took them again. When my son inched it up to a 34 his BGO said, "I cant tell you to take it again but I can tell you that I have had kids with similar stats who did NOT get in" My son took them again. I do know of the last few appointees from our district-they all had WELL over a 30.
The OP asked for anything else in particular they may be looking for-the above suggestion is free-so take it for what it's worth