Thats awful man, it seems you have an aversion to injecting, so the amount of carbs that is best for you is as little as possible!
I sometimes use a technique (thats not a good habit, but oh well... ) where I will estimate what i plan to eat and inject. Then i weigh the container of food and write it down (like the bag of chips, or jar or PB) and then I usually end up on the couch eating for a while (much longer then i should) and when I am finally finished i weigh the container again, and work backwards to determine how many grams of carbs I have eaten and top up my injection.
Its bad practice as you are supposed to inject before eating, but like we all do - overeating happens, especially with junk food. This is at least a decent way of getting the insulin in for what you have eaten, rather then waiting until you go high and struggling to bring it down.
Moral of the story is that its better then chasing the high, although you will still go high it wont last as long lol A walk always helps.