How is your role decided once you queue up? I NEED TO VENT

OK. So we've had dynamic queue for a while now. A few changes patches later and now I find myself asking the question from the title. Is a priority at all? It is finding the fastest available game with either role open? I ask because its driving me nuts now. There doesn't seem to be any rhyme or reason as to why I'm getting one of the two roles I'm choosing. I don't want to queue something up in my secondary in hopes that I don't get it and then get stuck with it. I'd tried my best to enjoy learning a second role and have and do enjoy a 2nd role, but 12 queues in a row without my primary? That seems absurd. A lot of people in queues have been saying the put the Secondary role first in hopes it works and they feel like they find more success in actually playing their primary role when its in the secondary slot. IS there any explanation to that, or just luck/coincidence?

Is there a place to suggest changes to Dynamic queue? I'm new to boards and get stuff deleted cause its "in the wrong place". But I'd really like to read some hard info on how these queues actually work now....What role is the most popular and stuff like that. I don't to complain, but Im just getting really frustrated with the seeming lack of priority for it wait to find a game for my primary role. THANK YOU