Thats the biggest thing with a drill press, that most people never check.....the run-out on the chuck! Most makers don't notice just how bad their drill presses are until they need to drill a super true hole (like in making a folder). My hat's off to you for checking that!
Although most folks don't think this way, one of the reason the higher end drill presses are priced so high is because they have very tight run-out specs on the chucks. The tightest chuck run-out that I have ever seen is on Burgmaster turret drill presses. For single spindle model drill presses, that are readily available, Ryobi and believe it or not, craftsman, have very good tolerances on chuck run-out. (for benchtop models)