Davan; If your performancre of the deadlift was not to your structure then it may not of actually targeted the right muscles enough – i.e. swapping from an exercise that did stimulate them to the dead that didnt stimulate the right muscles enough may have left you somewhat weaker in certain sprinting muscles. some people get on well with the dead, others dont.
What events are you good at and what ones are you weaker at? Are you tall, short, long arms, short arms, long torso, short torso?