Your cats shouldn't need any kibble what-so-ever, it doesn't help with their teeth. It would be like you eating crackers in the morning to brush your teeth, lol.
The best thing to keep your cat's teeth clean is for them to eat raw chicken backs with bone.
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Global here in Kingston will offer a slight discount on Wellness canned if you buy a case
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If your cats are a good, healthy weight then I would not increase their food, you don't want them to get overweight. I do have to feed Jasper, Puddles and Rose in seperate rooms because Sweet Pea eats all the food
so maybe you can feed Clover in a separate room so she can get her fill before Pepper gets the rest?