Hi natalia,
700grams of ice is fine , as that is what is used in the demos.
Firsltly, make sure your ice cubes are not too big, or that any are stuck together.
when you add the second lot of ice, as you bring the tmix up to speed - use yout TM spatula to help keep the ice moving.
this will stop any ice getting stuck under the blades, and will mean you wont get that moaning noise !!
If you keep the mix moving with the spatuala for about 20 - 30 seconds, all the ice should then be incorporated.
remove the spatula and pop t he MC in place and let it mix until the minute is up, and you will have nice fluffy sorbet
Tan