Reducing BP to normal levels depends on a number of factors. Fasting for 8 to 9 days would most likely be insufficient time in which to do so. If the cause is arterial plaque, then this would certainly be the case in my view.
Your choices as I see it would be to have one longer water-only-fast, of say between 20 and 30 days, which will clear the arterial plaque and strengthen the heart muscle, followed by a strict plant based diet of fruits, vegetables and nuts exclusively........http://www.drfuhrman.com/disease/BloodPressure.aspx