Stow- I don't think mainlining would help you out much in that kind of setup. It's a little trickier with clones (from reading, not personal experience) since you have alternating nodes. From what I hear, it's tougher to achieve the even canopy by mainlining clones since the branches aren't all originating from a single node. I think in your situation you may be better off just topping once or twice or maybe doing a little LST.
Now that I think of it, I did give it a half assed try with a round of clones a while ago. The branches were all different sizes, so I ended up scrapping the mainline plans and just bending/tying them into bush shapes.