Competence, ilvl, player lvl are totally unrelated. At each pug, you may find good, bad and average people, whatever the ilvl you setup.

Competence is something you need to acquire with experience. You can read all the guides on the internet, but until you don't actually go into the fight, they are just words. You cannot learn from the internet how don't panic and what to do when something gone wrong and needs be recovered, and how correctly avoid the mob skills.

Player level is something that is just grinded. After some time, everyone gets 50. It means, it is totally irrelevant as a measure of competence.

Armor ilvl, can be grinded by tomes, again is irrelevant.

What is left to you, is treasure the good players you find and play with them. Maybe in same FC, more fun too. Making automated systems to find the "good" players, is something like asking someone else to do your job.