yeah, SE has commented on this multiple times, they keep testing and the rates keep coming up as being the same. That being said, I've gotten more rdm seals than any other job, I have litterally thrown away enough rdm seals to make several pieces of +1. I hate to say it, but it seems almost as if your job levels are scanned, as is your +1 owned and seals are determined before dropping to be something you can't use. Strategy tip: level the job you care about only to 49, then spam the nms to get your +1 and +2, THEN level the job to 90; you should achieve full +2 in about 2 weeks depending on your available playtime.