RDF level range Onyxia

Hey,

I'm curious if anyone else has noticed the weird level range of the RDF.
For example a lvl 34 and a lvl 30 are qued in RDF and one is a tank and one a dd(not in the same grp). The dd has a tank missing and the tank has a dd missing. Both wait but are kind of in the same lvl range and could be in the same dungeon but are somehow not put together in the same queue.

I don't know how its calculated and at what level which dungeon is selected but it seems the RDF does not include many dungeons for a specific lvl. E.g. with 15 you always get Ragefire, with 17 you always get WC(DM is never popping up for me randomly) etc.

In my opinion at least the green and yellow dungeons should always be included in the queue.
Maybe this is all just coincidence or distorted perception but it would be nice if things could change for better wait times if it's not.

just means they have already been put into another "grp" queing for rdf, if they retake the the queue they will have a chance of being put into another grp.