UNDOCUMENTED MECHANICS
"Chance to convert" above follows a diminishing curve, not a flat gain per level; the other numbers in the same block do not: 13% at level 1, 45% at 5, 61% at 10, 75% at 20, 90% at the limit. Reaching the limit takes skill level 60, gear bonuses included, so the first few points are worth far more than the last ones.