A 63-year-old woman with long-standing hypertension and type 2 diabetes has an eGFR of 42 mL/min/1.73 m² and urine albumin-creatinine ratio of 65 mg/mmol. Her blood pressure is 138/84 mm Hg on ramipril 10 mg daily and amlodipine 10 mg daily. According to Hypertension Canada and kidney guidelines, what is the optimal blood pressure target for this patient?