A note on experience rolls in RQ-G:
In at least RQ1/2, the goal was always to roll under 100% minus your skill. I don't know how that worked in RQ3.
In the new rules, the goal is to roll above your skill and you get to add to the roll your category skill modifier.
So if you hit something with your sling,  and you have a 60% sling and a 10% manipulation bonus, you roll a d100 and add 10 to the result and want to get above 60 (total).

"To make an experience roll, a player rolls D100 for each ability check and then adds the appropriate skills category modifier for that ability to the roll. Runes and Passions do not receive a bonus to the roll.If the roll, as modified by the appropriate skills category modifier, is higher than the adventurer’s current skill ability, the adventurer improves their rating in that skill. A modified roll over 100 is always a success—as a result, adventurers can improve most abilities beyond 100%.After making a successful experience roll, the player can add 1D6 percentiles to an ability. The result of experience varies—an adventurer may learn much from one incident and little from another, no matter how successful they were at that time. In the case of opposed Runes, the opposingRune’s value must be decreased accordingly. Because the opposed Rune must have some value, 99% is the highest any opposed Rune can be rated, with the opposing Rune at 1%. If the player does not feel lucky, they can choose to add+3% to the ability without making the 1D6 increase roll.The player must choose to do this before attempting the ability increase roll."

(I post this because maybe it's obvious to everyone else this came as a surprise to me that I'd ever want to roll high on d100 in RQ unless it was for treasure)

As I mentioned before, we'll have more opportunity for POW and experience gains than 1x/season, but we'll stick with the stingy 3% or 1d6-1%.