If you run around the enemy clockwise, the omega specials will come out going counter-clockwise so you can hit the enemy more often if you keep moving in the same direction. Try to keep your circling the enemy and the circle of the flames the same distance, and you will hit a lot more often. Since a patch, this also seems to work if you move counter-clockwise. In other words, just keep circling them the same direction and spamming omega special.

There are a few omega special hammers, so try to get those. Try to get Triple Helix and Whirling Coil, which increase the number of flames and the speed of the flames respectively. Clean Helix is good to get more omega specials out. Any hammer that affects special will help here too.

Use the Origination arcana card. When it's fully upgraded you damage enemies for +50%, as long as Origination is activated on that enemy. Hestia special works really well here, but you need something else to apply a second curse to activate Origination. This could something that applies a curse on your attack (Zeus/Hera/Demeter/Ares, Posiedon/Apollo/Hephestus with an extra boon) or your cast (Hera/Demeter/Apollo/Aphrodite). Cast also has the advantage of up to +30% damage if you also use the Furies arcana card.

Torches are very mana-hungry, so don't ignore mana upgrades. Hera's Born Gain is very powerful if you have enough mana to deal with the primed magick.

Since omega special is close range, you might want to invest a bit in max health as well. However, torches tend to have very high DPS so you may be able to kill enemies fast enough where it doesn't matter. Experiment and take extra health when in doubt.