Yeah the 10% bonuses are present on Empyrean sets that need a contingent job trait to proc i.e Double Attack/Triple Attack/Conserve MP/Blood Boon etc and when you compound the percentages it's lower than 5%. The 5% pieces are usually those that are contigent on permanent statuses rather than a fickle job trait i.e Your HP%/Wyvern HP%/Pet HP%/Automaton HP%/Barspell Present.