Well, If your calculations are accurate, 10lbs at 18 in should put you in the ball-park of 15 lb.ft. 15lb would make it 22.5 lb.ft. IF this is correct, you are doing fine
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us. - - Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!