Digital BW, The Print

Regarding Posterization:

In comparing Piezo software & Cone inks; Piezo software & MIS 
FS inks; MIS original & VM inks with Epson profiles:

1.  Do all 3 of these produce equivalent posterization, or does 
posterization only show up with Piezo software?

2.  It seems clear from the reported experiences of many users 
that posterization does appear with some frequency when using 
Piezo software & cone inks. However, does it only show up with 
quadtone systems (1160 & 3000), or does it also happen 
equally with hextone systems (1200, 7000, etc.)?

3.  If it should be the case that posterization only shows up with 
Piezo software and equally with both Cone inks & MIS FS inks, 
but not does not appear with MIS original & VM inks printed using 
Epson software: could it be that posterization is the (perhaps 
inevitable) result of Piezo software forcing an extreme profile 
onto the printing output histogram from what are otherwise 
excellent files (that happen to contain lots of information in the 
3/4 tones)?

I look forward to hearing the experiences of others. To date I 
have only used Piezo software with Cone inks on an 1160, and I 
have experienced the posterization effect in 3/4 tones that  others 
also describe.

Cheers, James