Well, in the case of the titanium hammers I would simply go with 5x Special Gum and 5x Effect Gum; that’s about 500 vigour to start with.
Then, I’d use a Fate Paste 2, and use Pure Boon Compound 3 until I got at least the correct boons; if you didn’t get exactly the combination of 2 or 3 boons that you’re after, you could use the Decon Resin at this point, but I would probably continue none-the-less since I have more than enough hammers.
When the Fate Paste 2 buff ran out (5 rounds of using the Boon Compounds), I’d then re-apply the Fate Paste 2 and level the buffs until the AoE boon was at the level I’d want it to be. You then repeat and use Pure Boon Compounds.
In your case it might only get to AoE 2 or 3 with your amount of coils, I’m not sure what the flexibility will look like for a Titanium Hammer with your setup. I have the maximum amount of coils, so it’s possible you wouldn’t get that high either if you’ve only got a few coils.
This is my really basic strategy that I apply to most forging, since it doesn’t require much thinking, but it does depends on the luck/rng of getting the effect boon that I want in combination with the special boon that I want.
If you really want to get something specific and don’t have a lot of spare hammers/fists, then use the deconstruction resins.
But you don’t have to use my method if you don’t feel comfortable with its luck aspect. I am usually happy with the “less than perfect” forges I make though.
And I will do a little forge of my own for both the type of items you’re looking to do and add some screenshots.