I wouldn't worry about adult size being too big for those rats for a male.
My adult males eat ever 2 weeks a 50-80g rat. Mostly rats are around 50-60g for them. If I were to feed 40g, I'd just offer weekly. I prefer the slightly larger size and less often for males over 1 year old, but adults don't need to be eating the 10%. ~5% (3-7%) is more realistic for adults if you go by weights.
Most of the food they eat is used for growing as juveniles, so adults don't need nearly as much food since they're just maintaining size rather than doing significant growing.
My adult males right now are 1,100g at nearly 2 yrs old and 1,400g at an estimated 4-6 years old. Both do well on biweekly 50-60g rats.
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