I use sawgrass inks in my old ricoh SG3110 just for mugs. The blacks are spot on. BUT (you knew there would be a but) I only use 1 type of mug from 1 supplier and 1 type of paper. I use two aadkins presses (each has it's own time and temp) and a GK K3 which is at a totally different time and temp. If I change a blanket I need to fine tune again.
Now my old Epson 1500w has just died, that was on inktec ink. I have to agree with the above, the ink tec ink prints from the epson had more wiggle room when it came to time / temperature.
If I put a new blanket in a press the inktec ink would almost always print perfectly straight away, the sawgrass ink would require a bit of fettling.
As always I am sure I haven't been any help really.
Janners