So is smoking the best method all of you have found for flares? Is there a specific strain you use?
Smoking is the worse delivery method regardless of the situation. The only advantages smoking offers is
1) Speed - inhalation delivers the cannabinoids into your bloodstream very quickly, especially compared to edibles
2) Practical - all you need is some paper to roll the joint
The slew of disadvantages include wasting cannabinoids and the obvious health downsides of constantly depositing fibrous matter on your lung tissue.
Vaporizers offer all the benefits of inhalation without the health consequences of combusting your herbs, but they aren't as practical. For medicinal purposes however, I really suggest buying a vaporizer. A model like the Arizer Solo can be purchased for around $140 in America.
Ultimately, when flaring, you want tinctures or edibles to treat the flare, and vaporizers (or tinctures) as a palliative treatment to handle the pain and discomfort. Tinctures can be quick-acting as well if you swoosh them around in your mouth like a mouth wash until it's all been absorbed. Sublingual delivery is very similar to inhalation in terms of how quickly relief can be felt.
TL: DR
Edibles/tinctures is best for flares, vaporization as a secondary or palliative treatment