QTR-Quadtone RIP

I have a simple problem:  I was getting ink bleeding with Cone
supplied quad file for HPR and NK7 inks on my 2200.  So, I took the
qidf file that is supplied with QTR for HPR 1440 and went to
relinearize it for 2880.  Unfortunately, it turns out the 2880 puts
down more ink so that the patch with the lowest L* is actually the 90
patch rather than the 100.  The qidf file came with ink limit of 75
and black boost of 95.  Is there a simple guestimate of what I should
change with the ink limit in order to avoid the overinking?  My own
guess is to take 90% of the 95 black boost limit (=85.5) and set that
as the black boost.  Is that a good guess

Thanks.

--John