Update: With my knee issues I did not feel like chasing this anymore. Called a local plumber and he brought out a powered snake that is probably 2' longer than the one I rented! That's all it took. The line under the house could drain slowly so that's why I could pour a couple of pitchers of water into the pipe under the sink when I had it apart. Once I put all under sink back together, the trap couldn't work correctly I guess so it backed up quickly.
Anyway thanks for all the help and replies!
