Thank you @neumannsalva... Just made an update on the post above with the measurements I got.

I had seen that yarnsub website - have you still got the label of your yarn ? thanks :D

I don't think there's any problem with your pattern, but I think that it is important to include the yarn that you used : label / thickness and so on. I'm a 'visual person' so I can gauge things quite well which is why I don't think I achieved the (final) correct size.
I do not worry though, it was good to try and thanks for inviting us to try it.