I recently posted about transplanting autos ( I can't sem to find the damn post though ). I've done extensive testing and there is no need to do this tiering thing! Infact, I think your holding your plant back doing that as it has to grow the roots down then out from a small diameter base. I've transplanted maybe 100 autos. not only have I never stunted or damaged one, EVERY ONE grew visibly within 24hrs. some as little as 12 hours! The key is timing and container. You want a container that holds about a quart of soil. I use 24 ounce cottage cheese containers because they are soft and the rootmass slides out very easily. If you transplant between 7-10 days, the root will have just reached the bottom and have barely started to circle the bottom. Try to not break the rootball. don't water for a day or two before you transplant and the rootball holds together well.
As i said, this have never failed me and I've probably done it with 15-20 strains. Not one even noticed!