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Covering a room entirely with 703 or 705 turns your room into a kind of anechoic space. You will end up with the same problem as covering a room with foam.
There are studios build under those principles but they have at least two flat surfaces, mounted speakers and are large control rooms.
My suggestion for small studios is bass traps, first point reflections and maybe some diffusers just to give a bit of "nice sonic environment" to the room. Or just skip the diffusers.
A side note: Sheetrock when mounted over studs with mineral wool has some absorption. I did place the coefficients on another recent thread where there was a discussion regarding concrete absorption, but I can't find it
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