I didn't realize it was an outdoor grow and a mix of photos and autos. Bear in mind that the photos should be able to tolerate more nutrients than the autos. Generally, autos require half the recommended strength where most photos strains will tolerate full strength. I don't think they look bad. Is the problem with the photos or the autos? If the bud leaves are curling down, they could be slightly overfed. You might consider adding something like Botanicare Silica Blast to your feeding routine. It will help them deal with the higher heat outdoors and with the twisting as well. As to how much to feed, I would think about 2 gallons per each 5 gallon pot. I grow in 3 gallon ones and usually give them a gallon each. Also, since you're using RO, give cal/mag with every feeding. RO removes almost all the trace minerals from your water so the cal/mag is needed to replenish it.