Based on your post, the mixtures are likely very lean. Did you confirm the fuel level before adjusting anything else? The wet, or clear tube method is the best way to insure the proper level.If the level is really low, that carb will have a very lean mixture. It is also possible that the carbs are not fully seated in the holders, or that you neglected to put the vacuum caps back on the vacuum ports after synchronizing.
As far as the order of things, it looks ok to me. Did the pilot screws start out the same number of turns out? Are they still pretty close, or is one or two much farther out or in than the others?
When synchronizing, the actual vacuum reading is less important than having them all as close to the same as possible. The recommended idle speed is 1050, + or - 50 rpm.
This is all in the fsm, but it is spread out all over the place. See for instance pages 19 - 22, 263, 352 - 353, 361 - 365 and on page 376 are the jet and needle numbers for your model.