well as far as your stalled growth goes,starting with the 6x6x6 blocks is like putting a cutting into a 5 gallon bucket,once your root structure is built up in smaller cubes the transition to the big ones doesnt slow the growth down,i used to go from 3x3 cubs then to the 6x6x6works great and no lag,ill see if i can find u a pic from an old grow.Attachment 282369