What shipping module are you using for this?

On the prices going to 0.00, if there is not a definition, then 0.00 is the charge ...

If you end the definition in 10000:6.95 then no matter how many beyond your settings will go to 6.95 ...

That handles 11, 12, 25, 1000 ...

If that is not what you mean, then you need a new definition ...

One making definitions appear and disappear based on number of items, you need to give a bit more information on what module(s) you are using to manage your shipping ...