I'm A 70 YO Male, 2 Yr Post CABG4, Cyclist

I'm a 70 YO male, 2 yr post CABG4, cyclist and weight training adult. I'm on Praluent (75mg x2/month). Fabulous results: LDLs @46 (down from 160), Sm particle down to 550 from 1500, rest of lipid panel now normal. Don't tolerate Statins. Why is my Dr suggesting a 1-2 mg stack of Livalo if the Praluent brings us the numbers we need. Livalo make me mentally sluggish and muscle fatigued when exercising.