The bottling wand should be pressed against the bottom of the bottle, then released just as the beer reaches the top. When you withdraw the wand, you leave the perfect amount of headspace.
Since you are pressing against the bottom of the bottle, there really should be no splashing.
The thing is that the higher the bottling bucket the more pressure I'll get in the bottle. Since it was up 3-4 feet there was a significant flow down into the bottle which could possibly cause more oxygen to become entrained?