Not at all! I think you played it brilliantly! I love the studio version, too. It is the version that I first heard and the version that made me love the song. I like his slowed down version as well but I don't necessarily think it's better. Just different. I think you did the right thing keeping to the studio version.
And I agree, i like the slower version too, I hesitated what to do and then eventually decided to go for the original version. Or do you think I played it too fast? (Play Through?)
Suzi