That's great news! It sounds like he is doing fantastic for you.
Although, I will say that unless you have particularly large hoppers, he shouldn't have an issue with the size of a hopper at that weight, I don't think. I'd be curious to see a side-by-side (maybe glass in between?) to see why you're thinking he needs the skull crushed to get it down.
My honduran milk snake, Ghost, was taking 9-12 gram hoppers on occaision no problem at around 100 grams.
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