Could you tell me which strafe ability you used, and what angle of approach you took?
I used the Stuka Loiter from Lightning War. I put the M15 on lockdown then switched it to enemy AI after activating the loiter. First I had the m15 just barely outside of the loiter AOE then I tried again with the M15 directly in the middle of the AOE. Both times the guns aimed at the plane but never fired.
I didn't think to test it on recon flights though :/