I thought you already had that green pindot inbound? Hence the burgundy challis as the suggested second (and even better!) addition.
Mix it up a bit, man. I actually think you can carry a slightly brighter colour, like that green Panta, which is a lot brighter than my one. But you don't need two green ties. And grey is way down the list of your tie needs. With navy covered, then green, burgundy, rust are your next three I'd say.