Other than the choice of moving the center... off-center, nothing is glaringly standing out in that photo.
Important things to consider would be that speaker levels and distances measured by the room correction should be preserved. If you choose to turn off room correction, you should still use those measurements and levels.
Amps will not improve Sound Quality. This is a common myth. An Amp AMPlifies an electrical signal... it does not magically change that signal into something else... or at least it shouldn't. When used within their safe operating parameters, an Amp should not color or change anything about the signal.
Sound Quality is the domain of the Speakers.
There are still several questions asked above that will help in guiding you.
(Though my instict is that you should consider a proper upgrade for your Front 3.) (I just want to make certain that is the last option. We do love to spend other peoples money, here, but I don't want to be so capricious as that. Yet.)
![Cool :cool: :cool:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)