Think I found the answer for you. You wont have to fiddle around with extra configurations either.
Go to ESP Print Pro http://www.easysw.com/printpro/
The site says, "If you did not see your printer listed, try a printer driver with a similar model number. For example, the HP DeskJet 690C Series driver works for the HP DeskJet 690C, 692C, 693C, 694C, and 695C printers."
I don't see the Epson Stylus C86 listed, but I see the C82, C83, and C84 listed. ESP said to contact them if you had any questions.
When I went to linuxprinting.org, that site said it was the same driver.
Let me know if that solves your problem and that in fact they are all the same driver.