sram gear issue

Location
I'boro
Hi i hope someone can help , i have just got a second hand bike with sram force groupset on it . i have been tinkering around with the gears and in the small ring all 10 gears change lovely , no grinding ,catching or chain noise - but - when i shift into the big ring ( not a issue either , changes lovely on front deralier ) when i change up or down the cassette , it doesnt seem to change nice - almost as though its inbetween gears not knowing what one to engage with ( if you know what i mean - sorry it isnt explained very well ) i wondered if there is anyone out there with sram who could guide me through what i am doing wrong . i know roughly what i am doing but i dont know whether sram is slightly different and i am missing something simple - any help much appreciated
 
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