I always support a CLA on a new piece of gear after I initially check it out. BUT before sending it in, try removing the focusing hood, put like an 8x loupe directly on the ground glass (gently) for focusing. Hang a newspaper or an eye chart on a wall and run a bunch of test exposures making sure to get your camera as square, plumb and level to the target as possible.

Also, if it's been awhile since you've had your eyes checked you might consider doing that. I was surprised at one point when I discovered using a corrective diopter in my focusing hood or viewfinder made a huge difference in my image sharpness. It creeps up on you, ya know?

"If I knew I was going to live this long, I would have taken better care of myself". Eube Blake