Bringer of Flame - What is best Infernal Hound Support Gems?

Testing/trying out Bringer of Flames. My Main damage dealers are two groups of Storm Mages one DPS one Shock supported by Stormfire (shocks dont expire of ignited enemies)


I have seen two support gem setups trying to fully understand interactions and figuring out which is best for a Bringer of Flames set up.

1. Wildfire, Enormity, Loyalty, Fire Penetration, Fire Exposure

2. Wildfire, Enormity, Loyalty, Fire Penetration, Fire Mastery


Is Fire Mastery or Fire Exposure better for this purpose?

Is their a better setup I am missing?

Thanks in advance for all suggestions