You do not up-line an Airflo 40+ or Sniper line! The Sniper is a condensed head length version of the 40+. the 40+ has a head length of 35'. The Sniper is still over 30' with 15' of rear taper. That's the only difference. I will say it again: you do not want to try over-lining these. It is neither necessary, nor productive.
If you know of a shop that sells Airflo lines, they should have a catalog. The catalog contains a complete line spec chart. I can't find mine right now.