I do believe on that device to make full use of the power you would want something between 0.125Ω –0.361Ω. For instance dual Twisted coils using 2 strands of 22ga NiChrome80, 3mm inner diameter 6/7 - 7 wraps should be around 0.24 - 0.25Ω or other you could use more complex coils types like claptons, stapled, zippers etc. really any coil types with a high mass and low heat flux.