I've noticed that there were some really great action movies made in the mid-late 80s like Aliens, Die Hard, Predator, Robocop, and Lethal Weapon. I'd say
1. Die Hard
2. Aliens
3. Predator
4. Lethal Weapon
5. Robocop
Of your five, I'd prob. go:
Aliens
Robocop
Die Hard
Predator
LW - and I am a huge Shane Black fan, fwiw
but a personal mid-late 80s violent action top ten would be more like:
Aliens (1986)
Midnight Run (1988)
Big Trouble in Little China (1986)
Miracles: The Canton Godfather (1989)
Die Hard (1988)
F/X (1986)
Beverly Hills Cop (1984)
Shoot to Kill (1988)
The Terminator (1984)
Fortress (1985)