BM - try 6.5 you are close to perfect. BB1 & 2 is like swampman said lock out raise water to close to 8 and check. You can use lemon juice for down and baking soda for up also. 7 in 6.5 out = 6, lime works slow but will help in long run, if you use baking soda let it sit for 20-30 min and test.