Many report problems waiting for the root system reaching the bottom of the bucket to get to the solution when starting young plants. The solution is easy, just roll up a one of the blue paper shop towels and set it in the bucket vertically with the excess in the bottom of the bucket and the other end next to the new plants rootball when you repot. This wicks solution to the new plant. PHing water is a constant issue that can be addressed sometimes by adding peatmoss at a 4 part perlite to one part spanghum peat mixture. My water is always right at 7.0 to 7.1 and this drops PH into a very useful 6.0. I also like to add 1 part Fullers earth or diamentacious earth to the mix making my favorite mix, 1 part either of those, 3 parts perlite and 1 part peat. I usually mix in 10 gallon lots by using three bags of 8 quart miracle gro perlite, 1 bag miracle gro spanghum peat 8 quart, 8quarts of either of the above earths. If I am using a CRF, it is usually Lilly Millers version I add 1 tablespoon per gallon of mix, one tablespoon of Ironite per gallon and 1/2 tablespoon of epsom salts per gallon of mix. Then I water with tap water and my results are excellent with hardly even a burnt leaf tip. I add molasses and seaweed juice during flower.