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I have no experience with those particular microphones. But there is a general problem with the low-frequency response of cardioid microphones. Theytend to have a free-field response that begins to roll off below about 150 Hz. Proximity effect gives a compensatory LF boost. As an example, I have several Audio Technica AT3031s. AT specs them as having a response that extends down to 30 Hz. But there is a footnote stating that the measurement is at 12 inches. At that distance the proximity effect begins below 174 Hz. It's actually more complicated than that. But the net result is that the microphone is quite flat down to low frequencies when it is placed 12 inches from the source but it is down many dB at low frequencies when it is 20 feet from the source, as it would be when used in a concert recording.
So how to get the low frequency response that you desire? The simplest answer is to use an omnidirectional microphone. The Audio Technica omnidirectional microphone equivalent is the AT3032 and it has no attenuation at 30 Hz. Unfortunately spaced omni microphones do not give great stereo recordings.
An alternative method would be to use equalization in the form of a shelf filter to compensate for the LF loss in the microphone. I can't give a very good recommendation for how much boost to use.