Outlawtaz, I am not sure I can follow your thinking.

First, the 1515 is leveled to the X- rails by going with one single dial from
one end to the other. How thick the paper is, is irrelevant. I had to use
2 pieces of paper and a strip of packaging tape to make both ends the same.
Any tram issues are not important at this point. You just move the dial
end-to-end and make the 1515 totally parallel to the X linear rail.

Once set, now you can test the tram with the dual-dial.