Stuck at 60 because I don't know what to leve SAM/NIN... Please help.

[Syfurion]

My biggest issue is my SAM at 60 is okay, its pretty slow and static rotation with little actual resource use,but not as fun as my NIN but its also missing core mechanics.

Kenki Mastery 2 makes SAM feel worlds better, and is the main reason I won't take it into roulette that might drop me below that level. It adds 5 kenki to all of your standard rotational buttons, including gekko/yuki/kasha, making them generate 10 with the positional, 5 without. Most importantly it does not add any new positionals to your kit, meaning your ability to generate kenki without the ability to flank like in the overworld is actually functional.
My NIN isn't 70 yet, but so far it still feels fine, I don't have Ten Chi Jin yet though. The gauge feels a little tacked on, but not to level of something like the PLD gauge.