Serato Software Feature Suggestions

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Serato rane sl1 & cdj 350 for scratching

http://serato.com/user/id:Damien 10:31 PM - 1 July, 2014
Hi serato,
Ive been using my setup which is a mac book pro,2 Pioneer cdj 350 with my rane sl1 as a DVS system in INT MODE :-)....I used to play on cd...and for scratching it was really accurate and i could make some cool sounds....but since now I've moved on serato scratch live 2.5.0 Ive notice a little delay when i let go of my jog wheel i can't really do what i used to...eg when I'm making a scratch intro with a song while the other is playing it can get off beat at times even if i let it go on the beat,well I've try lowering down the usb buffering size but not much has change....& also tried the REL MODE.....

WHAT CAN I DO TO REMOVE THE DELAY???

Thanks