Give this a try and give me any feedback. Business is still very slow for me building a reputation to get more tuning jobs but I thought I would share this with others so they can test it out and I have quit putting time into this. I never get access to Ecoobost vehicles to test it on. It began as the Cobb Spreadsheet and I created a way to paste in corrections and calculate a new VE table and then back calculate slope and offset from that. This does not only correct slope like most people have been doing. If you copy your data from your tune into the top left spot it will calculate the initial VE table and from that and you can apply your corrections to it. You can change around the equations to make it work different ways if you want.

Ford Speed Density Calculated Good For Ecoboost.xlsx