you got to start at the beginning with colour issues,turn down your contrast to min,turn down your foreground and background colours to min,turn your screen volts on the lopti so you can just make out the picture,then turn up your background colours one by one until you can just make out that colour,then bring your contrast up slightly,then fore ground colours slightly,then contrast and brightness(then you can start fine tuning the foreground and background colours),finally get your focus spot on.
sounds to me your background red is too high,cant remember where those pots are on the k7000 chassis (usually neck card) but ken layton will know this.