Tiger HAD Block 2 SIM spikes DONT lock onto enemy tanks

2012-06-08-14.06.54

I’ve been doing SIM battles today in the Tiger HAD Block 2. This is the first time I’ve used spikes on SIM and I cant lock onto enemy tanks 99% of the time. I can lock onto helicopters with no problem but tanks it is almost impossible. I haven’t had this problem when playing RB. They will be in the open, no other heat signatures near them, I will be facing at them but no matter how much i press the “lock on key” it never locks.

Am I missing something when it comes to using spike on SIM or is it just broken?