Question: My stockpile is pretty full and my freezer is at it's limit, should I stop stockpiling?
I actually felt this way last summer. I had a full pantry including 20 boxes of cereal, 4 canisters of oatmeal, cans of green beans, bags of beans, etc. Our financial resources were very slim and I decided I'd make meals from our pantry and not buy any new pantry items. We focused on purchasing milk, cheese, eggs, fresh fruits and vegetables. We did this for two months with no problems. Then all of sudden, we were slap out of everything. It sort of happened all at once! I took for granted my pantry, assuming we still had certain foods when we didn't. I felt like I did before I started couponing.
If your stockpile is relatively full, I wouldn't stop stockpiling altogether. Instead, purchase two of each sale item during the slim months. Even if you can purchase only one of the sale item, it will keep you from becoming "Mother Hubbard's Cupboard". I realized this a little too late and had to jump back into full swing purchasing my normal 4 of each sale item. Our grocery budget didn't always allow it, and I started going over budget for the first month. After the initial month, everything started leveling off and was back to normal.
In the end, you have to do what works best for you. This is only from my own experience.