I've been wanting to experiment more with the Mid-Side technique, but I don't own a bi-directional / figure-8 microphone. Would I get comparable results standing in two identical cardioid LDCs for the side mic? Some provocations: 1.) The two LDCs I have in mind have good off-axis rejection. It wouldn't create a null spot as a figure-8 mic would, but I don't know how paramount this is to the effect. 2.) The above isolated, it seems to me that the extra few inches' difference between the diaphragms of the cardioid side mics ( versus no difference in a figure-8 ) should be negligible, provided each cardioid is equidistant to the mid mic. I haven't read about anybody doing this, so I have to consider there's a reason for that. But I wanted to get opinions to be sure.