GB don't take this the wrong way, I'm talking in general here.
IMO this is a good example of the lack of information about insulin. Insulin is a means to an end not a means unto itself. Taking exo insulin is not like taking exo test where the latter simply upregulates the desired body functions.
Insulin use has to coincide with energy intake. They cannot be decoupled unless you want an immediate trip to the hospital/morgue.
I see people here who are jacking their calories so that they can take their 10 iu of exo slin. This is backwards. Plan your meals and daily energy intake and then match the insulin to that. So if your PWO meal comes out to have 50g carbs, then take your 5 iu (NOTE: THIS COULD STILL BE TOO MUCH - I USUALLY NEED 1 iu PER 20g!). If you just jack calories to take more you are going to get fat.
Insulin is like the fuel pump in your car. Upgrading it by itself is going to do squat except possibly make your car run rich. It will not pay off until you build the motor up to the point that it needs more fuel.