Daybreak blue is definitely a good model (I think a further post trained GPT 5.6 sol). Alot of the capabilities they talk about Astra having though have been available with good harness engineering for a year now.
As far as harness engineering goes, it boils down to your ability to clearly define goals or success criteria, and safely facilitate the necessary access via the harness. There is no easy single piece of advice here, sadly. Though it would be helpful if you said what 'for Cyber-security ... other user-cases' means in your case.