Meh. I want to keep adding more parts. And I know all the tricks of the trade in launch/docking. I think that adding another couple thousand liters of fuel to the Spirion's tanks would do the trick. The thing's in career mode, so far. I don't play with mods, I just rely on my own skills. I believe my major concern is this: If I cover all those Clamp-O-Tron Sr. ports, making the station symmetrical, would it lag my system worse than it is now? EDIT: At the moment, the only time there is severe lag is when I look at the horizon line on Kerbin, or another body. Otherwise it runs just fine. This is the lifter I use. If I added another level of those medium-size Rockomax tanks (1/2 the Orange one), I think I could lift another two to three tons, or even more.