I doubt its your injectors. Uberdata is buggy as hell. What version are you using? Are you burning chips or are you using the ostrich?

If you're burning chips, use the latest version of uberdata 1.7. Are you datalogging to see the exact areas of the map you are trying to modify? If you just go by the column headings, chances are that you are making changes to the wrong portions of the map. The uberdata load columns don't correspond correctly to the load values it takes to reach that column. IMO, its impossible to tune uberdata correctly without datalogging. I won't touch it (especailly at altitudes other than sea level) without datalogging first.