Project Weight Gain

For the past 6-8 weeks, Uno's and Abby's weight is very much like the stock market...up one week, down the next week despite being fed the same amount of food every meal
The problem is I don't know what is their ideal weight At 6.4kg and 5.5kg respectively, both Uno and Abby eat and sleep well, are active and the fat layer around their rib cages seems ok... Still trying to push for a little more weight gain so gonna increase their food intake a little more...