Idle ST and LTFT fluctuates quite a bit depending on lots of stuff (even switching on/off the lights). As far as I can tell the ECU resets idle LTFT to +10 on every restart and then it works it's way back down as I suppose it's switching through the different idle tables.
Also your engine idles in these 4 fields marked grey. There is stock +5% load compensation.So you get 5% extra fuel right there, if you didn't change it.
Simply changing those 4 fields will change your idle LTFT. You can give yourself whatever idle LTFT you want by changing those cells.
But why do you think idle LTFT is so important? You are not driving the car in idle. If you don't have high LTFT in the relevant areas that you are actually in while driving, why bother?
