At 350-500gm, your babies should be approximately 7 months to 1 year of age. Why do you want to go back to a 5 day schedule? Have you always fed every 7 days? Are they gaining weight? Are they feeding well?
If they are gaining weight and have good feed responses, I wouldn't try to fix what isn't broken. They could be eating every 5 days, but many people switch to every 7 days at roughly 500 grams anyhow.
If they appear to be hungry all the time, then you could go to every 5 days, but I'd feed a slightly smaller rodent. There's no need to feed for weight gain if they are healthy babies. They will be healthier if they are grown more slowly.
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