I am making a partial grain IPA on my stove top. I usually boil 6-7 gallons of water to get a batch that yields 5 gallons. I want to cut down on brewing time so I'd like to steep the grains in just a few gallons for 30 min. at around 150 degrees and then add the additional water (at 150 degrees) after the steeping is done. Is this a bad idea? Will it change the character of my beer?