Graet I think there is a problem with Vardiff

I have used the same worker on two Stratum rigs.

and I have set the workers VarDiff to Dynamic

On one rig the diff goes up to 10.

and even on the 100Mhash rig the diff goes to 10.
 I don't think the 100MH/s can do diff 10.

and do you change dynamic diff by connection?