Turning up the "sharpness" will not make it sharper.
It will only add "noise" to the picture. Get a Avia or DVE disc and then
you'll see how it works. I have my sharpness set at 15. But really anything
between 0 and 20 is fine, more than 20 i get "noise". Your tv may be different.
It'll take a month before your tv settles in. Has to go through a few heating and cooling cycles. The picture will improve dramatically as that happens. You may have to do manual convergence...