Lexus GS 2015 GS350 Fsport vibration at high speed

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Hello all. I should start by saying I just replaced rotors and pads about 1k miles ago. About 700 miles later, very slight vibration driving at higher speed, HUGE shudder when braking at high speed. Oddly, it seems a little worse once car is warm. Any thoughts, other than I bought bad rotors? One mechanic had it on a lift, thought the front control arm bushings were bad. He showed me the movement with a pry bar and it seemed slight to me, at which point he said there might not be that much play after all. Isn't some very slight movement within the bushing expected? It does not act like a warped rotor at low speeds; doesn't grab and release when coming to very slow stop, etc. No noise typical of bad wheel bearings. Any thoughts?