Digital BW, The Print

I have recently jumped in with a set of the latest MIS VM Ultratones 
PLUS a set of the Ultra'clone' colour inkset - I am running two 
Espon 1290s, both with CFSs and new carts.
After 4 long days of trying everything I know (windex, purges, 
leaving-well-alone, re-installing CFS / carts....) I STILL have yet 
to get a decent print out of either system.  Both are using the 
Eboni black and it just clogs and clogs.  Halfway through a page it 
will dump black ink on the edge of the page, or band, or just give 
up all together.  I can get a perfect nozzle check and then 2 inches 
into the print I've lost it, clogs again.
I am desperate- I know there is a caveat on the MIS site regarding 
the ultratones being in 'betatest' and that if you don't like them - 
tuff, but I can't even get a print out to tell if I'm happy with 
them! Plus, the colours act the same and I thought that Eboni was 
now the 'standard' black?  I did get a few step wedges out and my 
1290 curves seem off compared to the old VMs which were perfect - I 
did the dirty and knocked on Pauls door for some advice on this, 
either way, it seems academic at the minute.  All the other inks 
seems fine, the coloureds and the greys - it's just the black in 
both....
I have switch the bottles on the VM system, now to try the PK 
black.  I have done about 20 purge pages but I still have got all 
the Eboni out yet - I guess this is a long process (anyone tell me 
how long it takes to purge a cart of old ink just by switching 
bottles?)
So, sorry for the rant - I spotted some posts about clogging eboni 
earlier but the issues seem to have dried up.  Is anyone still have 
issues (or successes - that would be even better news!!!)?
Please drop me a reply - advice or sympathy - don't really care 
which!

Steve