QTR-Quadtone RIP

I cannot find the answer to what is probably a dumb question:

In using the step wedges to set the limits for the different inks,
should I use step wedges printed at 100% or step wedges printed with
an ink limitation setting equal to the default setting for Black that
I intend to use when I create the curve?

At 100%, everything on the black wedge beyond about 55% is full black.
 So I printed a calibration sheet at 55% and it looks about right
(though I will check it to make sure that I am getting 100% black at
the right end).

Assuming that 55% is right, then which sheet do I use in doing the
rest of the work?  Logic suggests the 55% sheet, but I'd like to get
this right so I decided to bother you all about it.

Thanks, and please forgive if the answer is in the User Guide and I
missed it.