I think you have gotten some GOOD advice in your post. I also have tried a couple of 14lbs this year just to practice with (Nemesis and Threat). I have been throwing 15 for a number of years. What Rags and others have said is basically very accurate. Get something you are comfortable with that you don't get tired (physically)of throwing and don't have to muscle to get it down the lane. Ball speed and revs and REPEATIBLILITY OF THE SHOT are the key. I have a granddaughter who is 15 years old and one of the top high school bowlers in her conference 198 average, she throws 14, great rev, 15 mph+ ball speed and can carry light hits, brooklyns and just scatters the pins, with her it is like everyone has said,"ball speed, revs and such match up". Recently she has started to throw the ball through the breakpoint, not much but she is starting to overpower her equipment (revs and ball speed)so I can see us moving her up to 15 lbs when the high school season is over in Feb. NICE TO BE YOUNG AND STRONG. You and I are on the other side of the age thing, going down and getting our equipment to match up to us physically is important to maintain the Repeatability THING. NOW TO GET TO MY MAIN POINT! Don't jump back and forth from 15 to 14. If you decide to go the 14lb route, put the 15's away and let your body "MUSCLE MEMORY" get adjusted to the lesser weight. After a few weeks you should reach a comfort zone and know whether it was a good move. Also, if you don't already use a wrist brace don't be afraid to try a number of them as they can drastically help your rev rate. SORRY FOR THE LONG REPLY. GOOD LUCK.