http://www.felinediabetes.com/FDMB/threads/7-1-smudge-amps-336-pmps-195.231717/ Looks like 5.25 may be the magic dose.
You got a 59 with 5.0 units on June 28th. Since you are following SLGS, you should have decreased to 4.75 units, not increased to 5.25 units.