Good job on the fine-tune, and welcome to the community!
I think you’ve managed to improve on the standard response on GPT-3.5 and I do agree that sample A is the better one. 
I’ve previously posted some tutorials here on the forum about fine-tuning GPT to respond in your own writing style and generate prompts, you might find these interesting.
Thanks for sharing! Always feel free to ask if there’s a question you can’t find the answer to.