Perry class Frigate vs Tu-22 Backfire...what's the trick?

[Halcyon]

I'm playing the N. Atlantic convoy vanilla mission, and about 20-30 minutes in a Tu-22 Backfire appears from the NE and fires all its missiles at me.
I've tried every strategy I know to avoid the missiles, but no matter what I do my ship always gets hit at least once.

I've tried going completely EMCON and flank speed perpendicular to get out of the missile's seeker path while pumping chaff, but the missiles still find me.

I then tried using my helo's radar to pick up the inbound missiles and using my own SM-2 missiles to shoot them down with the CIWS as backup, but every SM-2 misses and the CIWS misses as well.

I've tried turning away from the missiles to present a smaller target, plus give my CIWS the best chance at hitting them head on while pumping chaff out on both sides of the ship, but at least 1 missile always hits me.

What is the secret to avoiding Backfire missiles?