Velocity Trouble with Vray Instancer

[mathieu_boch]

Hello, 

I need to render with vrayInstancer, and the velocity out of the Tyflow is so much higher.  
The same setup with Pflow is working perfecty.
I try with lot of options , with tycache in .tyvc and .prt but not find any issue.

Have you any answers about this ? 
Thanks

You can find max scene in attachements