I have 4 and free feed. I don't have "gobblers" and have never had a problem with weight. I do feed them all a home cooked meal for their dinner meal and they "nibble" on the kibble throughout the day. I feed them Health Extension small bites. I also keep water out. Works for me, works for them. They are all good weights for their builds.
Do what works for you. After checking with your weight, and you want to try it, go for it.... Make changes accordingly. If you know your babies, you'll know what's best for them..
Good Luck!! Let us know how you make out!