Hi! Switching to a low carb, wet/dry combo for my 4 year old twins. They weigh 10 pounds and 15 pounds. The heavier guy is a taller, bigger guy. I think the smaller one was the runt. anyhow - I'm switching from Royal Canin selective kibble to Wellness core chicken canned and kibble. Not sure how much to feed them. The guideline says they should be getting like 2 cans a day which is a lot. My cats won't eat more than 1/4 can a sitting. So how much kibble do I supplement with? Plus - they aren't too keen on this kibble (I'm switching slowly). Any suggestions? Should I try other kibble? Wet? What ratio?