GSM 26, LTH 29, ARM 33, ARM 37, could pick out a bunch. Theres 'A' Recipe, and then there is 'The' Recipe for each rank. none of them are 2-3 ranks away. I know them, done them.

So you dont think it is bad that you can only list 2 skills worth using? You can honestly say that with these 2 skills on your bar, you can complete absolutely every recipe without fails? How does hand of the gods ensure success?- It reduces success rate >.> so your fails wont lower durability... Ingenuity does not ensure success, it just lowers synth difficulty. I use it all the time. That is why it is broken. None of these skills ensure absolute 100% success in synthing.
Not every recipie that is magically more difficult than others is a grind recipe. you'll find some of them in local leves.

And have you never tried synthing something without using skills at all a few times, then synthing using every skill at the most appropriate time possible? can you really not see the lack of major difference? Something 2ranks above you and less, skill usage doesnt matter, unless it is one of THOSE recipes with unnecessary fail rate, even if you're above them.