I can add onto EV's response:
Each time you gain a higher level in crafting, all the previous levels chances of crafts are increased (it says it on the C.A Crafters License).
For example, lets say at lvl 5, an amp craft has a 5% chance of crafting pc. Then when you get lvl 6, it increases by 5%. So now that osmium amp has a 10% chance it will be pc. So at lvl 7 you would add 5% more and have a 15% chance of crafting an osmium pc, while that redosmium grade is 10% and forcium would be 5%.
That's just an example percentage, although it's not that far off for helms
However, If you want to be almost guarenteed to get pc, yes, do a bunch at a time. Its still down to luck, just like slotting gears, you can fail 4 times in a row even with only 19% fail rate and then slot a lame slot or an awesome slot. I personally have made 3 or 4 pc helms in only 1 craft attempt since December.
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