I've done it before, and it's a cool sound, but I kinda felt like Rectos kinda stop sounding like Rectos at some point if you do that.
I've also never liked running the mid knob above noon on Rectos. The mid knob is focused at a certain frequency that I feel like if you run it too high, they don't sound less scooped, but they just kinda sound weird/worse, LOL.
I think it's a cool sound that people don't often realize is hidden in a Recto. But I don't feel it's a Recto's most "Recto-y" sound either.
To get a nice aggressive midrange from Rectos, I like the results I get from slamming a hot and mid-focused pickup into them so that you can lower the gain knob as low as you can, boosting them with something with aggressive mids like an SD-1, and runining them into V30's. JMO, of course.