Why 70%?

22 is in the ground family (2, 4, 8) and 6 is in the heart family (3, 6, 9). 22 is a master number, so it is matched as its root, 4. Ground with heart starts at 70. The nudge comes from the roots: 4 + 6 = 10, which leaves 1 when divided by 3, so the nudge is 0. 70 + 0 = 70.

Out of the 78 possible pairings, 55 score higher than this one. Rarity: 3.1% of birthdays from 1950 to 2009 give 22 and 10.2% give 6, so about 1 in 159 random pairs of birthdays land on exactly this pair.

The rule is our own design, not a numerologist's chart, and numerology is not a science.