Hi everyone, just my two cents. I'm quite noob at comps, have never had premium nor bought a dlc, member of no clan. Still I've won a couple and usually place in top 20 in most comps I get to join, often top 10.
Sometimes I do wonder how the ones at the top have so much success while I'm struggling but then I chat, ask around, try different things on my own and with work every time I tend to do better.
It really doesn't seem to me that there's any kind of rigging. Sometimes people have more time or more info or acquired the appropriate gear.
Don't give up, I arrived late to the comp aspect but it's so motivating and fun I wish I'd started from earlier.