I don't really understand how increasing corporate tax could encourage corporate spending. It seems to me the opposite is the obvious mechanism. The more money that goes to the government, the less money a corporation has to put into the economy. If the corporation is in a "save" mode, they're more likely to spend less if they are taxed more than they are to continue the same spending and save less.
Maybe that's not what you're saying or maybe the effect is different than I'd expect (economics is weird sometimes) but I don't get your point there.