If you are going to set the veal to normal it is best to use the longest datalog you can. What you can do is get multiple logs (one to the store, one back, one to work ect.) then when you go to open them in the MegalogViewer hold the Ctrl key and select the ones taken while driving on that tune. This will open them all in as one datalog and you will get overlapping data points, I have found this to be the most accurate method by far.
once that is done highlight the entire fuel map and hit the smooth function key.
You also need to remember that a 1 point change from a ve of 50 is a 2% fuel change.