Sounds like you bought a few too many weaned rats for your one BP. No worries though - they'll definitely get eaten.
My two that are about the size of yours blew through the 3-400 range in about a month. One went from 277g to 407g in 26 days. The other went from 297g to 434g in 31 days. These are all weights while empty. This was on an every four day feeding schedule with f/t weaned rats between 39g and 45g. I have a large order of small rats on the way this week so I can step these two girls up.
My recommendation is to stick to the percentages for awhile. If that means needing to double up the rats at each feeding, then by all means do so. From my reading on here, I'm planning on sticking with the percentages until my girls are ~1000g. What I am doing now is backing down my biggest girl from every four days to once weekly. My next biggest girl I'll be doing the same with when she tells me she's ready. Not that I expect this to happen any time soon with her - she'd eat a rock if I put it in front of her on feeding day. I'll still be giving them the 10-15% at each feeding - just less feedings as they grow.
For you, if he continues to go into hunt mode a few days before feeding day, you could switch him from every five to every four until he tells you that it's time to slow down.
Hope this helps!
Eric
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