Yup, I basically do the same thing. I sometimes gently wipe a CA Duster across her first, then do the soft borderless Zaino towels with Z6. Even if the car is warm, that still works before i cover her (She lives outside :() If the car is cool, I use Z8 (since I had already bought it); Z8 does NOT work well if the car is anything but cool!
I also have a Black beauty - The Beast!
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2010 Black 2SS/RS; 6M; IOM, GFX, sunroof; ADM Race CAI; Zoomers CB; Viper Alarm; Pdaft F&R sways, Adj Endlinks, Rtrailing arms, Camber kit, strut brace, Front Trailing Arm Bushing; SLP Skip-Shift Elim; Tinted lights/windows; Hurst Short-throw; LoJack; Door & Dash ABL Mods; ********; JBA Shorty headers; AACStyle LEDs; Stillen DS rotors, Hawk Ceramic pads; Havoc Blk Chrome wheels: 20x9s; Lingenfelter Blk Al Pedals; RevXtreme Catch Can; Goodridge SS lines; Ported TB; RK Sport hood; Hotchkis chassis brace; KW V3 coilovers;