I'm currently having good results with my leg routine but I'm wondering if they could be better. On leg day I hit my quads and hammies. Calves are on a different day. Here's the current routine:

5-10 minutes on the stationary bike to warm the legs.

Squats: 1 warm up set. 3 sets of 6
Leg Ext: 3 sets of 8

SLDL: 3 sets of 6
Laying Curls: 3 sets of 8

Like I said I've been getting great results with this routine but I'm wondering if adding another compound exercise would push me that much further. I definately want to keep the 4 exercises I've got. I only want to add if the general concensus feels it's not enough volume. And I do deads already but I've got them on back day. And that's where they're staying

So what do you guys think. Thanks.