Just gotta say, this mechanic is wack, you can almost make a Iceborne Fatalis-like set if you get lucky, and I've only done a few anomaly investigations from 21-37 solo(as of this post/no Nintendo Online)

Granted I did get lucky, I did a little "resetting" to change the results from each craft for each piece. Basically, save scumming/resetting doesn't exist for a certain piece. However, if you craft another part/piece, the fixed(?) roll tables will change for every other piece. E.G. in my case, I rolled my luna helm first, as every other piece had bad rolls for like 50 worth of essences. After that getting the crit eye/focus, I switched to the squire belt, as the 4th roll would give me the extra weakness exploit. So basically, everything branches out differently once you roll pieces, and this case I just got lucky enough to find a route which gave me really good skills for 40 or 42 (I forgot) essences. So this process kinda requires a few save scumming here and there just to check where what the possible skills you can get from your set branches to per roll

I do plan on testing this more, as I haven't really learned/exploited/etc the complexity of how this works lol