This might be outdated as cheapest option because pricing has changed a lot since i last made a few like this.
If your doing 2 socket bases, buy a bunch, make magic, get quality to 20% and vaal infuse to 30%. 5% or so chance to get to 30% uncorrupted.
If your starting 3 socket bases, that can be expensive to get the base going, getting to 27% is like a 30% chance. If you will use a lock for 4th socket or sanc, pushing for 30% might be worth while. Depends a lot on base costs to finished value.
Perf Aug/Annul for T1 Res and T1 prefix (spirit or ES mod). I dont actually worry too much about hitting spirit here because its actually decently easy to desecrate as there is a very limited pool for prefix desecrates.
Perfect Aug for 3rd mod and make rare. Depending on the value of the base, I might try to whittle to ensure all 3 mods are desired before fracture, though there could be blockers you get. Then divine them up and desecrate and fracture.
If you hit Prefix, you annul down, chaos spam for T1 resistance, then dextral/greater omen perfect exalt slam for the other 2 T1 resistances. Annul if you miss, sometimes back to chaos spamming again, sometimes keeping 1x or 2x T1 resistance and then exalting again. When done, then you can perfect exalt a prefix. If it misses, use sinistral crystallization omens to convert to desecrate with abyss essence and rib. Slam again and if you miss, omen of light off the desecrate and convert the missed mod again. Repeat till you have your second prefix. Lastly desecrate roll for last prefix.
If you fracture the resistance, you can annul down, chaos spam the 2nd resistance and dextral exalt for the 3rd, annul on misses and repeat. After suffix are done, I would desecrate prefix and get life as a blocker. Then double exalt slam prefix. Here you can do whittle if you got a high tier life roll (suffix are safe) or do the omen of light or sinistral erasure method to reroll until you hit 2 preferred prefixes. Then desecrate last one.