I struggle to get the best concise messaging quickly, do you have any tips or frameworks, or is this just a skill?

There are a lot of great frameworks and templates to help you with messaging. And, while building concise messaging "quickly" takes a bit of skill, skill isn't enough if you haven't done your research.

The tips I'd suggest are:

• Find a template you like and adapt it to your org: PMA and April Dunford's templates are great places to start.

• Conduct research: do customer interviews and competitive messaging breakdowns, understand your personas, do a bit of testing, and fully understand your offering and the value it brings

• Write: Write your first draft. Make it as long as you can to fully convey everything you think is important. Give it a day or two, and come back. Then, start removing the stuff that isn't needed. Put it away. Then come back. Over a few revisions, your messaging should get shorter and crisper and convey only the parts that matter most to your audience.

• Test: test and adapt your messaging to your target audience.
  
  I wrote an article on messaging a few months back if it helps.