Are you talking about pre soaking the rockwool? I soak for 24 hrs in 5.5 ph clear water. But, my rooted cuts still seem to take a while once they go into the 4" blocks. I tried a crop putting the rooted cuts in a 16oz cup full of grodan croutons. My buddy does this. It works killer. The cuts start growing right away. Then, I use a hole saw to bore a larger hole in the Hugo block to accept the 16oz cup. Once the plants are well established in the cup (10 - 14 days), I cut off the bottom of the cup, cut some slits about a third of the way up the cup, and plug it into the 6" Hugo block. I just did this part last night. I'll take some pics. The 4" block is less work than the cup, but I just hate waiting for the freshly rooted clones to start growing after getting plugged into the 4" block. Do you have the same issue? I think the block is too wet until roots start sucking water. The croutons have lots more air available. However, those little fucking croutons are a messy pain in the ass.