I have a binge eating kitty as well. And, it can be very frustrating when trying to whittle her weight down while still maintaining the others' weights. Another talk with your vet is likely in order, but, in the meantime, I can share what I've done that has worked. Maybe something will help you as well...
Cassidy is always hungry. She will beg for food constantly sometimes. And, she can also be very domineering at the feeding station if left to her own devices. So, I have had to feed her separately. When it is mealtime, I put her in the bathroom with a kibble dispensing toy. It keeps her mind busy while I am feeding the others and it is a good way for her to get in some much needed exercise and enrichment. I also went from feeding twice daily to three times and that has helped her get through the day without the addition of more food. Once the other cats are finished eating (I should mention that they all have their own dishes and measured portions), I take Cassidy into the spare bedroom and feed her there. She gets a measured portion three times daily. All kibble put into the treat dispensing toy is included in her measured feeds. At one meal per day, usually in the evening unless time does not permit, I place her meal in dishes around the room -- up on the high shelf of the cat tree, on the nightstand, on the far windowsill...so on and so forth. This gives her an opportunity to "hunt." And, while it was frustrating for her in the beginning, it has become a bonding experience.
Unfortunately, due to her weight, I've also needed to change her diet some. She also has IBD and has gastrointestinal issues. So, meal time can be a potentially stressful time. For both her and me. She eats a specific diet and everything...EVERYTHING...is measured out. I've also had to incorporate more wet food into her diet to help her lose some weight. It's not been easy and there have been countless consultations with (numerous) vets at work. But, we seem to be on the right track and things have gotten better. My other cats are maintaining their weights, Cassidy is on a weight loss diet that is working, and there is less stress when it comes who, what, where, why, and when I feed. What I do with Cass and the other is definitely more time consuming than what I was used to. And, it takes a lot of patience and dedication. But, with time, we're getting there. It's been as rewarding as it has been aggravating. What's important, though, is that it works for us in our situation. Everyone is different and I suspect you'll have to come to a conclusion about what will work for you, Mooch, and Noodles. But, it can be done. If nothing else sticks or makes sense, remember that.
I should mention that another component has been activity. I spend 30 minutes a day (at least) playing interactively with the cats. That means I'm waving a wand toy around, shining a laser pointer, or throwing a ball or furry mouse around the house. Sometimes, I noticed that Cassidy or the others would beg for food because they were bored. And, if that's the case, I try to give them new and entertaining things to do on a daily basis. On my days off, I up our play time to about an hour a day. If I can't do that, I will give them something to do on their own. And, regardless of the day, I switch out their toys and give them things that they need to think about as well as play or interact with. Keeping their minds busy keeps them from wanting to spend their time eating. And, it's a good way to ensure that they are active and moving around. What I do with them is tailored to their personalities and I've seen them become happier, more well-adjusted cats. I also have a lot of vertical space and scratching posts to keep them moving and entertained as well. Every little thing helps.
Rome wasn't built in a day. And, Cass is certainly not going to become an ideal size overnight. Awareness and willingness is key. And, it seems that you have both going for you. I wish you the best. A hungry, cranky kitty with a weight problem is no fun. But, as I said, it can get better. Talk to your vet, keep an open mind, and good luck...
