Jason, you say nothing about your age, your athletic abilities, how training fits in your daily life... so any comment cannot be a very informed one.
You chose this program because you liked its promise. Just because you are doing better than you had anticipated does not mean there is anything wrong with the program. I say you are shooting for your first marathon, you are doing well, just keep it that way.
Being overzealous now may mean disaster (or injury) later on. If you really have extra energy to expend, don't add to your prescribed mileage but go for a swim, do a little weights, stretch out a bit...
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