Hi Daniel. The team has investigated the issue you reported thoroughly. Our conclusion is that there is no bug with the -65F but simply with the logic the game uses for IR guidance. For IRMAVs, the sensor must lock the center of the 3D structure. In this case with the command structure, the center is in fact in the middle space between the two antennae.
To further that, our SME has suggested that rather than using an IRMAV, to instead use LMAVs as they are for more accurate on a structure and can provide a better probability of kill. The SME suggests only using the IRMAVs for tanks and ships from his own experience and that they preferred the LMAV dude to its increased range and accuracy.
Hope that helps, I will merge all -65F threads and mark AS INTENDED whilst moving it to resolved.