I have had two Sabre2s of the same size. After each canopy had about 50 jumps (the point where they lost enough of their perosity to settle down while packing), I found the snivel characteristics to be about the same. For me, the snivels tend to be about 600 to 800 ft.
My suggestion would be that first up, you make sure that what you think is 1000 ft is actually 1000 ft. Deploy watching the alti, making sure to throw the pilot chute at a fixed altitute, and watch the alti throughout the deployment. If these 'long' snivels are only happening rarely, I would tend to point to packing, and pay particular attention to what you are doing with the nose cells. If they are a frequent occurance, I would talk to PD about a new slider.
Just my 2c.
Pete
