Wormholes

Two of the main benefits of RR Tengus are the cost (much cheaper than equivalent self tank) and the scalability to harder sites by just bringing more of them.

I suggest looking into using a T2 rigor, T2 flare, and T2 CCC combination, it usually ends up cap stable with good skills and will improve your dps against frigs and cruisers significantly more than a target painter. And yes, the c-type passive shield hardeners are cheap and should be used.