Why is it when i do stiff leg deadlift, i only feel it in my lower back. Shouldn't I be feeling it in my hamstrings as well? Does this mean im doing it wrong?
It's b/c your lower back is probably the weakest link in the equation. You could try doing them last in your workout after your hams are sufficiently pre-exhausted.
I like to place two plates on the floor and elevate my toes on these so only my heels are on the ground , keep constant tension on the hams and get a good stretch at the bottom but come up 3/4 on the way up not locking out at the top . Try going lighter and think of it as a stretching movement .