Negotiating an offer, is it too late? - what worked for you?

It is the first offer in 4 months and I do not want to mess it up. I do not usually post, so bear with me. The benefits are decent. What wording worked?

Thanks for writing this out. I went through something close to it 4 months ago, and it got easier once I kept a simple log of every call and form.

If they say no, consider asking for something else, such as a review in six months.