I'm late to the party but wanted to throw in my opinion. Be careful not to CREATE a picky eater. That is right -- I think too many puppy owners create picky eaters by trying so many different things when the puppy is just not in a big eating mode. Puppies are like human kids -- they are not always going to be hungry and when other things are in upheaval, their eating habits may change too.
I have NEVER heard of a puppy that actually starved itself to death. Lots of owners THINK this is happening, but they will ALL eat before they starve. But if you try to cater to every whim, keep adding all sorts of good tasting JUNK to their food, you will create eating problems for your pup.
Stick with the food the breeder had them on. It is okay if they don't eat a lot for a few days. If you think blood sugar drop might be a problem, just watch VERY carefully, and use a little Nutrical rubbed on the gums if they seem to need it. If you want to add a little wet food (Same brand) along with kibble, no problem, but I would
not put Karo syrup on their food! A little parm. cheese won't hurt, but is really not necessary, especially when you are not changing food. Your little one is just not as interested in eating as all of the other new things around. So, skip the gravies and all the other junk additives. Ensure there is fresh kibble out 24/7 and that the puppy is reminded occasionally of where it is. Also, be sure fresh water is offered often. More important to make sure they are drinking enough water than worrying about the actual food intake. They will eat when they get hungry enough. So make it the good stuff and don't cave too easily to adding things that are not good for them. You can easily create a feeding nightmare with these wiley little ones. They train us pretty quickly if we let them.