The viscosity of the oil will not affect the warm-up much. The warm-up is mainly the result of the heat produced by the fuel combustion, not the heat produced by the oil friction.
The OP is experiencing poor revving due to high oil viscosity and that's why I referred him to the Widman operational-viscosity calculator. You can't make the driving operational oil viscosity lower by using an oil with a higher laboratory operational oil viscosity. That's completely illogical. The OP is right in that he needs an oil with a lower operational viscosity, and the Widman operational-viscosity calculator will be his best friend in this matter, as the 0W rating does not correspond to the cold operational viscosity but only the cold-starting and cold-pumping viscosities.