Well....if i understood well its like this....I choosed AM and the others of the DP, because i believe in the genetics of Dutch Passion and AM, like presented in catalogue of DP also can handle some mistakes, i learned it growing them outdoor last summer.... there may be also other breeders doing good...but i started with DP in my time as old school-photo-grower, indoor and outdoor and was really satisfied....after i started actual grow i got massive problems of ph run-in and run-off, before midflush in grow ec/ppm and ph were right, but after midflush at day 28 to 30 ph was doing crazy...using Wairas " rough calculation guide of ph" i found here on AFN it was like this....all airpots run-in was at ph 6,5, but run-off measured 7,0 to 7,3....normal 14 liter pots were quite well off run-in of 6,5 and run-off about 6,4 to 6,6..like i posted before in this tread it woudn´t be bad about...founded someones thread who kept his soil inpot stabel at ph 7,0 and run-in at 6,0, so he answered, that going in-pot wet by feeding-solution at 6.0 soil would be wet at 6,0, but keep drying the stable soil at 7,0 the plants can range all nutes from ph 6,0 wet to 7,0 dry in-pot.....i know odlschool-knowledge of plants can reach best nutes at 5,8 to 6,8 ph-run-in, like the bestseller Jorge Cervante book, everybody, who wants to grow, should know it....