stick with 5 days. if its working for you, keep it up. some of us have great success with only 3 days a week, some of us with 4, some can even get away with 6 days. its about what works best for you.
if 5 days is working for you, why mess with it? we can advise you on what works best for US, and hope it will turn out the same for you, but if you already know what YOU need, keep doing it. personally, i have had my best success doing 5 days a week.