plants falling over buds heavy stake yoyo

Hey all! Here's a little background info: Indoor grow Strain is GG4 Week 5 flower Coco mix 20 gallon pots 1000 watt hps bulbs Have 2 flower rooms and 1 veg room, 20 plants in veg and 10 in each flower room. AC is zoned. Temp is at 74 and humidity 45. Hope I'm not missing anything... the...