That is a MUCH better USG! I would have trouble believing kidney disease is a major concern at this point. Please forget about trying to feed Mikey K/D, it is a nasty food which could actually cause kidney problems instead of "cure" them. I won't go into the details, but basically cats NEED protein. Feeding a diet devoid of quality protein is counter productive to good health.
I think the vet is confused about the glucose issue and how it relates to CRF. Another fructosamine is a good idea, but this would indicate diabetes, not kidney issues.
Let us know what the results are, and good luck with getting more food into Mikey.