I suggested the OP read over
ClieOS' comparison thread, which provide a lengthy list of warm and sweet sounding earphones, and a brief but concise overview of each.
Indeed, the FXT90 boasts noticeably greater sub-bass weight and impact, but the GR07's low end is no slough either. As far as midbass hump is concerned, the FXT90 boasts much more prominent sub-bass, than mid-bass. For an excellent balance of sub-bass and mid-bass weight and impact, that noticeably outweighs even the FXT90, I'd recommend the ClarityOne. At their current price (~$112), they're as good an option as any, and offer an open, airy, warm, and bassy (albeit overall balanced) sound signature.