Mixed bag

Well, yesterday and today I had a change to play for my newly purchased 70-200 f2.8 VR lens. I'm still very new to this lens and I'm having a little trouble with AF in different modes. Below are some pictures I've taken with it attached to my D70. Maybe some of you more experiance 70-200 VR users can let me know what I'm doing wrong or right. Thanks. Bill
Since I've had it, I think the lens is having some trouble at long distances. This shot I was at the opposite goal mouth. Using a monopod, AF mode: AF-C, Sports mode, 1/2000 sec f/5.6, iso 200, FL 190mm. Still not as sharp as I would have hoped for. The lens setting was M/A, infinaity 2.5M, VR on, Normal.
Monopod, AF-C, Sports mode, 1/1600 sec f/4.5, iso 200, FL 180mm. The lens setting was M/A, infinaity 2.5M, VR on, Normal.
Hand Held, AF-S, Sports mode, 1/2000 sec f/5.6, iso 320, FL 170mm. The lens setting was M/A, infinaity 2.5M, VR on, Active.
Hand Held,AF-S, Sports mode, 1/2000 sec f/5.6, iso 320, FL 200. The lens setting was M/A, infinaity 2.5M, VR on, Active.
Hand Held, AF-S, Sports mode, 1/2000, f/5.6, iso 320, FL 130. The lens setting was M/A, infinaity 2.5M, VR on, Active.
The thing that I notice the most is at long distances it doesn't quite focus correctly meaning at the infinaity symbol, at the same time if you touch the focus slightly it then focuses. Not sure why it does it, but I would have thought that it would focus best it could, I'm thinking on taking the lens and D70 to Maxwells for them to double check it. Is it possible that the lens may need callabrating or am I doing something wrong?
Any help would be great appreciated.
Regards,
Bill
Since I've had it, I think the lens is having some trouble at long distances. This shot I was at the opposite goal mouth. Using a monopod, AF mode: AF-C, Sports mode, 1/2000 sec f/5.6, iso 200, FL 190mm. Still not as sharp as I would have hoped for. The lens setting was M/A, infinaity 2.5M, VR on, Normal.

Monopod, AF-C, Sports mode, 1/1600 sec f/4.5, iso 200, FL 180mm. The lens setting was M/A, infinaity 2.5M, VR on, Normal.

Hand Held, AF-S, Sports mode, 1/2000 sec f/5.6, iso 320, FL 170mm. The lens setting was M/A, infinaity 2.5M, VR on, Active.

Hand Held,AF-S, Sports mode, 1/2000 sec f/5.6, iso 320, FL 200. The lens setting was M/A, infinaity 2.5M, VR on, Active.

Hand Held, AF-S, Sports mode, 1/2000, f/5.6, iso 320, FL 130. The lens setting was M/A, infinaity 2.5M, VR on, Active.

The thing that I notice the most is at long distances it doesn't quite focus correctly meaning at the infinaity symbol, at the same time if you touch the focus slightly it then focuses. Not sure why it does it, but I would have thought that it would focus best it could, I'm thinking on taking the lens and D70 to Maxwells for them to double check it. Is it possible that the lens may need callabrating or am I doing something wrong?
Any help would be great appreciated.
Regards,
Bill