The code that you are using (from Galoob) is already maxed out. Luckily, there is another timer involved with Wolverine's regen. I've made 4 different codes at 4 different regen speeds. You can only use one at a time. Let me know which one you like best (I'll add that code to my site). The value number in parenthesis is the amount of time it waits before going through another cycle. You can add the Galoob code if you want to make regen even faster, but I don't think that will be necessary.
AWKT-CAER
Wolverine's regen is faster (value = 04)
ALKT-CAER
Wolverine's regen is faster (value = 02)
AGKT-CAER
Wolverine's regen is faster (value = 01)
ACKT-CAER
Wolverine's regen is fastest (value = 00)
EDIT: I also made a code that lets him regen instantly. Let me know if you want it.