I wouldn't advise a plasma pistol on your lord...any over-heats and that 160pt. model could be taking a wound from his own weapon. Might be better to just take a bolt pistol in this case for the extra close combat attack.
Predator - Mixing lascannons and a heavy bolter might not be the best option as these both do different roles, I would say either T-L autocannon and Lascannons, all lascannons, or T-L autocannon and heavy bolters.
For your lord - drop spiky bits, add mutation, drop armor, drop infiltrate and give him a bike and daemonic aura. Out him behind your bikes so he can't be targeted and use him as a strong counterattack. Also, instead of a power weapon, give him a dark blade.
Predator - Mixing lascannons and a heavy bolter might not be the best option as these both do different roles, I would say either T-L autocannon and Lascannons, all lascannons, or T-L autocannon and heavy bolters.
For your lord - drop spiky bits, add mutation, drop armor, drop infiltrate and give him a bike and daemonic aura. Out him behind your bikes so he can't be targeted and use him as a strong counterattack. Also, instead of a power weapon, give him a dark blade.