I am not familiar with your printer, as it is not available in my region. But it seems to me you're laying down too much ink on the transfer paper and the transfer temperature could be very high.
By standard Epson ink, you mean Dye ink or Epsons pigmented ink?
As a general rule when ever you use Neenah SS, the printer driver settings should be Paper Type: Plain, Quality: Standard, Image Correction: Off.
I never print in Grey scale for apparel printing, all my blacks are printed as Rich Black. Grey scale in my opinion does not provide the best blacks.
If you have installed drivers for your printer, try selecting the printer profile for "Plain" from color management section of your photo editing software.
You might have to do couple of test prints on plain white paper to see if you're getting the grey tones you wish to have. Even after trying, you still end up with same shades, the only choice would be to change the ink brand.
By standard Epson ink, you mean Dye ink or Epsons pigmented ink?
As a general rule when ever you use Neenah SS, the printer driver settings should be Paper Type: Plain, Quality: Standard, Image Correction: Off.
I never print in Grey scale for apparel printing, all my blacks are printed as Rich Black. Grey scale in my opinion does not provide the best blacks.
If you have installed drivers for your printer, try selecting the printer profile for "Plain" from color management section of your photo editing software.
You might have to do couple of test prints on plain white paper to see if you're getting the grey tones you wish to have. Even after trying, you still end up with same shades, the only choice would be to change the ink brand.