Best to aim for 5 or lower. 6 is acceptable if medical reasons prevent you from going lower, but it gives little safety margin for daily fluctuations. If you have to settle for 6, be careful to keep limbs well wrapped and generally avoid exposure to cold.
Disclaimer: The purpose of Gout-Pal.com is to explain the history, evolution, and intentions of Keith Taylor's GoutPal Services. So it is a personal view that will incidentally include health issues. But this is definitely NOT a substitute for professional health advice.
Information on this website is provided by a fellow gout sufferer (Keith Taylor) with a love of accurate data. But no professional medical qualifications. So you must seek advice from a qualified doctor about gout and any other health matters.