What is your weight/height ? Losing 10-15lbs if you are very overweight is fine, but otherwise it sounds to me as if you might well be under eating as you should be putting on heavier muscle, therefore losing inches not lbs.
Lifts seem pretty good,a little bit better than mine overall at about the same age and 1 year of lifting. If you want to DL up you need to do chins/rows. Dr Sullivan, if I remember right, suggests working in two DL sessions -one heavy, one light.