Question on Bowling Ball Weight

I see a lot the 10% of body weight rule. However, I only weigh 120-125 pounds and am currently using a fourteen pound ball. It does feel a little heavy. Span is fine but I'm still playing with the holes to get a good fit. I don't really want to go lower than fourteen since a fourteen house ball feels like nothing to me. Though I can't seem to adjust to this. Any suggestions?