Digital BW, The Print

Colleagues,
I´m in a jam, perhaps someone of the IP4 experts can help me 
(at least I hope so).
For a show, which will be opened Sept 6th, I have to print some 
large format b&w images (about 60x80 cm) on a 7500 printer. 
I have had very bad luck with this printer and MIS FS and MIS VM 
inks. The MIS VMs were posterizing a lot and the MIS FS inks 
have been clogging a lot. I even had to change print heads twice.
In the moment the Epson OEM inks are installed and I have no 
problems in printing my color work.
But I have to change the inks to print b&w again. 
I have six carts with the new piezotones at hand, but I´ve no 
piezo24 driver for the 7500 - and I´m not sure if I can print those 
inks with my IP4 driver, (BTW it worked great with MIS FS until the 
clogs appeared).
So the question is: shall I try to print the new piezotones using 
the old piezo IP4 profiles ore are there profiles for the new 
piezotones available, which I may try (maybe ß-versions). 
Alternatively I have  a lot of  spared "old" piezoBW ink for my 
3000. I could put it into my 7500 doubling two of the carts (M and 
C).  I heard that in the old Cone hexatone system light M and light 
C are simply doubled standard M and C - anybody knows  if this 
is true? 
This way I could print the old piezo inks with my IP4 driver.
Any recommendation highly appreciated.
Thank you very much.
Bernd