FFS - Operator working with NC machine and storage..

Hello Everyone

Working on FFS scenario where my requirements are ;-

1.Source is generating random parts and its providing to machine 

2.Two Operators are assigned to transfer the part with different Travel time for part pick and drop may part 30 sec and Empty travel 15 sec

3.Operator is travelling between NC machine and Buffer (storage)

I have created the model and able to give Travel time for part pick and drop for single operator but for empty travel not able to assign different time to operator or path.

attaching the model and FFS scenario ppt also

Any help is much appreciated. Thank you.