Well when I do them I really play around with the pelvic position and finish the lift in a posterior pelvic tilt - doing this for something like a 3x8 DOES give the glutes some soreness.
But I think in your case you could be better off doing dumbbell or even barbell BSSs - they have always got my glutes SO sore... basically the best exercise for me in terms of glute development (the dumbbell BSS). You can do them after the squats.
