I'm not sure how you could say the Badlander has less gain than a dual rectifier. Granted, I've never played the Racktifier, and maybe yours has the gain mod with the 1 meg gain knob. I'm a metal player, I've had rectifiers for the past 10 years, and a Dual Rectifier is unusable for metal without an overdrive pedal in front. The magic of the Dual Rec comes out with an overdrive in front, absolutely.
The Badlander should have had more gain, but it does not need an overdrive to get great high-gain metal tones. So I'm not sure how you could say it has less gain.