I have used FISS for long time and you need to have it loaded high in loadlist and priority. It should be the first esp after the masters and uslep. There are actually many mods that use FISS.   And I did remove the unwanted files from BFAP1.3 repacked it. No other changes. Was annoying when MO wanted to move it all the time.   No you cant so easy delete them. You have as I understand installed whit NMM. You must make sure that you use the one from BF. And you must use the other from S