All things being equal, if you are running rich at tickover your revs will increase as you weaken the mixture by screwing up(sic) your jets. When it starts "hunting" back it off a couple of flats. Your revs may well have increased by about 200 at this point. If your tickover is smooth and it seems smooth when driving, the carbs might be fairly well balanced even though the mixture is way off. If this is the case, make sure you adjust each carb equally to keep this balance. If it all goes pear shaped you'll just have to get the book out and start from scratch.