Hey guys. I totally disappeared on you but thanx for all the input,
In interest of paying forward your help, i'll tell you what we did for the next guy who comes along and reads this.
Measured the "sag" in the ceiling again, with a level and found some big humps in the ceiling. There were 2 spots that were 3/4 of a inch lower than the rest of the line in the ceiling, where the wall used to be. Which is not terrible, but it bugged me, so we decided to put a beam in.
Lifted up the siding and cut a small slot in the shiplap to fit 2x12's through. Built a 3 ply beam in the attic, put it in place and uses some conveniently shaped Simpson brackets, that i found at the local hardware store, to connect the ceiling joists to the beam. Made some blocking at both ends to prevent the beam from falling over (its never falling over unless theres a major earthquake. In which case the whole house is probably coming down anyway). We also filled the walls on the top floor and bottom floor with 2x4's and 2x6's to transfer the weight of the beam straight down to the foundation. Oh and we jacked up on the few spots that were low in the ceiling before we did all this.
So long story short, i overkilled the hell out of this project. But i'll sleep a lot better knowing that its overbuilt as opposed to being sufficient. Total cost was about $300 and took about 8 hours start to finish.
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