The photo black can be improved by replacing your cartridge. Either your photo black ink is not good, or your refilling was not successful or your cartridge needs purging (especially if you use the top fill method)
Also, try cleaning the copper contacts on the printhead and the printer with a little alcohol and tissue.
Is printing color important to you right now ?
Also, try cleaning the copper contacts on the printhead and the printer with a little alcohol and tissue.
Is printing color important to you right now ?