Update from my side:

I've just managed to reach the target (the said 150 grams of BW for 30 fishes). Did the water change today. I have 6 babies therefore 30grams/day.

My schedule:

Water Change every 4 days (no feeding on the first)
BW feeding schadule. (100gram=35 cubes BW)
0600, 0630, 0715, 0745, 0830, 0900, 0945, 1015, 1100, 1130, 1215 (AYU)
Each feeding 1 cube and final meal AYU
Water Change day, No feeding for rest and nibble on carpet algea for Head development.

Cheers.

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Japanese Ranchu is another ball game