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I would trade it up for the CZ75SP01 myself Jerr.
I would take a minute and try to ascertain what the 509 is doing. Is it not shooting to point of aim with a consistent sight picture? If you sight picture and firing technique are constant, then the problem is the pistol. I would try at least 2 other brands of ammunition as well just to rule out ammunition. If you can't pinpoint the issue then trade to the CZ75SP01.
Does your wife/spouse ever get upset with the amount of time you spend on this website?
I would at least try a few things before I gave up on the gun 1st shoot it from a rest is it accurate then? different ammo? have other shooter try it? if it is still inaccurate then its got to go