Having trouble lately with kindling number with an average of 3-5 kits per litter when I was getting steady 8-10 earlier in the year. I'm free feeding pregnant and nursing does and their weights look good I'm rebreeding 7-10 days from birth depending on litter size and the pellets are 17% protein what can I do to change..also the light schedule they're on is 15 hr. light per day