A few things at play here as well, the Mesa oversized recto cabs are not super think sounding to begin with. I have an old 97' angled recto oversized cab collecting dust in my space. I find that the Bogner's particularly sound better with a more traditional dimensioned cab. My Mesa DR sounds better in a traditional straight cab as well. I find the 100's to be a tad scooped sounding as well, so that would also change the tonal dimension of the Shiva some going from one speaker type to another. If you like your mesa cab, maybe get two H100's or T75's and put them in an X pattern in your Recto cab. My Shiva sounded incredible through an X pattern cab with two V30's and two Creamback H75's.