Motion Control and Motor Drives

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step reponse using MAX in 7344

when I tuning the servo, there are something I don't know clearly.Please see the accessory.
I don't know why there is a negetive time and it is flat.It means that the motor don't reponse at all during that time?
How should I tune the PID to make it disappear and get a faster settling time?
 
Another question if I want to make  Kv  take effect in the MAX, must I using Dual loop feedback?I mean I should use encoder 3 as the secondary feedback to make Kv,Aff,and Vff take effect.
 
Why can't  most of my question get a reply? I don't express my question well, right?
 
Please help me.Thanks
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