Pretty much how I craft most anything. I seldom waste mats, but as @Grimdian stated, they could make decon 4 and have it return 100%.
This video guide @Jiivita created may not be the best way to craft, but it has proven to be the most consistent for higher tiered tools, at least for me. I use this and while there is a bit of RNG especially rolling the first boon as you really want to roll the hardest boon first then once that one is rolled the other two aren’t near as difficult. You could also use a boon transmute one or twice without much consequence. Pretty much key though to stack more vigour and stability.