You have to make sure the conversion setup matches your settings. For BF4 this means setting ADS and Scope to the same Vertical Monitor Distance as your USA setting:
The "All" option use the IRNV for the Magnified Close Range sensitivity. FLIR use the same sensitivity setting but have a different FOV, that's why you get a different result. The 45 sensitivity from All is the correct one I recon.
Take the FOV "change" as if you were to aim down the sights. Would you want the same 360 ? Probably not !
Keep your aim consistent @kelvinator and convert everything via 00% method.