P.S. I agree about the wind. It can be a real pain, especially since butterflies insist on sitting on the wobbliest flowers they can find.
Yes, I have found this to be quite a problem, especially thse on grass stems. You set up your shot, it looks great, a woosh, a breeze sets it off.
I usually shoot 400 ISO and go down to 200 or even 100 given the weather. I'd only go higher at night. I am not sure why you'd need higher than ISO 1600 which some cameras can now go higher. I have had little problems with shooting at 400, sometimes I notice my shots look a bit grainy, so I can say 200 would be better. Technically he is now ISO should be used IMO:
ISO 50/100/200 = Sunny weather
ISO 400 = Cloudy weather
ISO 800/1600 = Night
I sometimes sharpen my images on computer, but this does create more noise sometimes, but then you can reduce noise (not sure if you can on photoshop but Paint.net has a function that says "reduce noise") it softens up the image depending on how strong you want the noise reduced. its not always good as it can soften up image too much, but if you have a grainy image, it can be ok to use.
Latley I have used my monopod more, its good for areas that are awkard to use a tripod and to get who butterfly in focus a higher Apature value is usually good, but anything over 22 then you'll get more of the background in focus too, and for better shots, you won't always want that. I had the oppourtunity to shoot a small toroiseshell today in various modes and times/AV values as it just sat there and let me shoot away. But if you cant do that, most cases you cant, try focusing on a flower and shooting different modes and times until you get an image you like, if you can get a good flower, a butterfly won't be too much harder to get, but you need to take into account that a butterfly does not remain stationary like a flower does I have taken photos of thistle heads to get them in focus and the background right too, so when I see a butterfly on it, I can do similar as the shot would be just the same with the butterfly, but your attention would be on the butterfly.