I always use ASAS when docking, I don't know why you wouldn't! I've been building 3-port docking rigs and though it's more work than single port docking, it's not that hard with well balanced ships. Sometimes it takes two or three tries, but the second and third tries are usually just undock whichever ones stuck (maybe undock the ones that stick immediately afterwards, sometimes the ones that didn't work dock as soon as you undock the others, there's some kind of time or distance check that prevents recently undocked ports from redocking) press n for a second to back away, press h to go forward again, and see if they stick. I've just started some 4-port rigs, but I haven't actually docked one yet. I've learned 4 (or more) -way designs are better than 3-way because if an engine fails for some reason, you can disable the opposite member and limp around on two engines. I could build a 4-engine ship with a 3-port docking rig, and keep it compatible with all my old stuff, but it simplifies things (and makes for prettier ships) if the docking matches the rest of the ship. At least that's the theory since I haven't tried to dock any yet The other theory is that if 3 out of 4 ports dock, that's good enough, and it might take less tries to get 3 of 4 than it is to get 3 of 3.