3x per day is rarely a good idea, although I've seen a couple of owners try it with some success.
Sam's numbers are low enough that even in his high range, he's still in pretty decent numbers. He often hits nadir and then "surfs" through the middle of the cycle meaning that he stays in roughly the same range for several hours. The curve I did on 6/10 during the AM cycle shows what I mean. However, I am switching to Lantus soon in the hope that an insulin with longer duration will help him a bit more.
Having an early nadir can be because of too little insulin, too much insulin, not the right insulin for the cat, or just a quirk of the cat. Time and data can help you figure out which one it is.