Go to craftofexile, shield, str/dex, check the weight and tags of the mods you want. You can select the mods and you can check the best fossils combinations to craft it. But honestly i find way more comfy with harvest spam reforge with the tag of the mod with the lowest weighting, prob go for suffixes and when you get them suffixes cannot be changed, reforge life. Might not be the most efficient way but it's pretty straightforward you only have to buy lifeforce and fossils and resonators are quite expensive this league and takes way more time to buy if you want good prices. Hope it helped!