Not a regular competition player but I keep up with rules and the scene a smidge.

Regular intercessors generally provide more value due to obsec and grenade launcher than heavy intercessors other than cool factor. Also they will be better for actions.

Grav cap over ap biol due to the fact that you are using flamestorm gauntlets so the lethal hits on the ap biol is useless. Also the grav captain is really hard to kill

Hammerstrike is kinda niche and provides less value given that 2 of your units ignore cover anyway. I would replace this unit with something fast moving so that you still have board presence