Changing positions doesn't make any difference. But if it makes you feel better: it doesn't hurt either!
Every time you try to get a Butterfly you have a 10% chance to actually get one. This doesn't mean that you will have to breed 10x and then: eureka - a Butterfly! It just means that it a bit harder to get than, say, a Firefly or a Thunder...:D It also means that you have to be a bit more patient. And you should get different 'spoils' as well (Blazing, Scorch, Sonic and Smoke are all possible results from this combination).
Every time I have to get one of the 10% dragons, I hope I get it within 20 tries - any under that I consider myself lucky, anything over that... - it's all part of the game!
But luckily for you: Butterfly will be around for a while. Just stick to it and you'll get it. Eventually.
BTW: this is by far my favorite! It's not making me any money, but it's just too cute...