"More for more" was never the case with a Mega fill. You received 400 SOT for 150 Ironite. It was the same as doing 5 separate 30 Ironite refills. 30 × 5 = 150. 5 × 80 = 400. With Friday's update you do receive 120 SOT for 30 Ironite. Just fill as needed at 30 a pop since you can continually fill and stay away from the mega fill.