yeh on the slider you have to count up to where you have the arrow, it sounds like you play with quite a high sens, i suggest a razer, they are all basically the same, just different looks, therefore how they feel in the hand. Also if you have big hands a Razer will not suit you as some can be quite small.
Also i suggest try lowering your sens down, everytime you play lower it by 0.1 till you get to around 3, trust me it will help you improve.