Once you get your system to sound like flesh and blood performers in room chances are you'll love being closer to performers. The fact you need them to be at distance from you is sign of something amiss. Your new amp and pre are higher resolving than prior setup, this is exposing some flaw elsewhere. Nothing wrong with your equipment here, both are top flight performers!
I believe you have nailed it. The OP's current equipment is really top notch and in my opinion actually providing the more real or natural presentation. However I do recognize that if a more recessed sound stage is desired then go for it. Individual preference is a critical factor.
Charles