UserWiki:Isania

REPORTED 0 - 10 levels above cap gives you 1-2% chance of HQ. 11 - 30 levels above cap gives you about 10% chance of HQ. Generally referred to as "HQ1 tier" 31 - 50 levels above cap gives you about 25% chance of HQ. Generally referred to as "HQ2 tier" 51+ levels above cap gives you about 50% chance of HQ. Generally referred to as "HQ3 tier"

It is also believed by many that day of the week, moon, time and direction influence your HQ rate.