The 10-15% body weight is just a rule of thumb. You don't need to be quite so literal, though I applaud the effort.
Think of it like this...snakes are opportunistic feeders, so in nature they eat what they can, when they can. Nobody weighs their food and schedules their next meal for them.
Yes, we have the luxury of regulating their diets in captivity, but remember, it's just a guideline. If the meals are a little light it's not the end of the world.
I also applaud the effort to try to "make up the difference" by adding a hopper or fuzzy, but honestly it's probably not worth the effort. Fuzzies and even hoppers are barely developed so don't offer a whole lot of actual "meat on the bone". So for the time, money and effort it's really not worth it. I promise your snake won't miss the added 6 grams or so.
Just feed off what you have and move up to larger prey next purchase.
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