CP's can handle pretty big meals. I've heard 15% of body weight is fine. Yafe has eaten meals that were 15%+ with zero issues.
I would say weigh the prey and if it's less than 15% +/- of Fernie, you should be good to go.
Most people wing it by size of rodent to body size of snake. That's fine for BP's, Boas, etc. that really shouldn't be stretched.
However, CP's are pretty stretchy and I find the weight formula works well.
As long as your temps are good, which I am sure they are, I wouldn't worry about upping prey size. I may do the same for Yafe soon. He's 400G+ and I am feeding weaned rats at about 40G +/- every other week. He's slowed in growing, but he's no worse for the wear, so I'll feed weaned a little longer.
EDIT: I would move to weekly feedings though with 15% of body weight prey items.
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