Attacking strela with groms is waste of ammunition.
Try a tor or even a hawk system.
What I do against targets that I cannot get close enough is,1) do all the proper steps to set up for the groms 2) then eyes on target and distance measures from target area,3) disengage radar, Pipper full scale and now u aim with the pipper dot,4) take altitude and fire missiles at 12km range and aling with target,5) engage radar stay on target 2-3 secs close radar and brake away.