Well with what you are doing I'd say glute/ham raises would be a good addition. You also may be able to do some Romanian deadlifts. One or the other. I'd vote for the glute/ham raises.

The stregth ratio to prevent injury and strain is minimum 80%. So in other words that would be something like doing extensions with 100 pounds max and leg curls with 80 lbs. But I think it can be as much as a 1 to 1 ratio (although I'm not sure). It's hard to test in reality though.

Going lower may be of benefit because it will allow the hip extensors (including the hams) to fire optimally. And of course fixing your form as Dave pointed out is going to help since transferring the weight forward is firing the quads and putting the hams in a weak position, causing them to strain.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.