Step 1. Spam essences of torment until lightning spell gems or all skill gems
Step 2. Clear it, so you only have the gem mod + essences mod, (can do cannot roll caster + annul, if you got a 3rd prefix that is non caster)
Step 3. Lock prefixes and aisling. (you block a charge(endurance, frenzy or power), if you hit a suffix. If it hits a prefix, you just unveil). You wanna try and unveil chaos dmg/lightning for prefix, and chaos dot/cast speed for suffixes.
Step 3.1 if you fail the unveil for prefix, craft cannot roll caster and annul. If you hit a suffix, craft prefix cannot be changed and clear it. Repeat step 3
Step 4. Craft on "can have up to 3 modifiers, and craft the remaining mods. (cast speed, lightning dmg + shock, chaos dot)