SRAM cassette onto hope bulb issues Help!

As the subject says i just bought some mavic rims with hope bulb hubs built in as im new to the maintenance side i pressumed i could just transfer my current cassette to the new hub my cassette is a SRAM 10-Speed 11-32 from my standard ghost 5700 it fits fine the problem i have is im at the end of my gears and the three small cogs are not in use it seems my original hub stuck out longer so i could hit every gear , do i need to buy a new cassette and if so which?? or is it something i have done wrong ?? please help
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You need to set up your rear deraileur.
Look for a video on youtube and read Sheldon Brown.
http://sheldonbrown.com/derailer-adjustment.html