You need to re-evaluate your settings a bit. Let's take shot #3 for instance. ISO 1600, f/5, 1/1250s. This is ludicrous really, you should be using ISO 100 (or 200 may be the lowest with your nikon) in which case you would still be shooting at a perfectly acceptable 1/150s and have a lot less noise and a cleaner photo. But what you really need to consider is using a narrower aperture (higher f/ number) since virtually none of the flower is in sharp focus. At macro distances depth of field gets very small and you will find yourself needing to use f/11 and upwards to get a whole flower in focus.