if you really want to be self-sufficient in your CUL power-grinding, I might suggest doing the level 45 gatherer/crafter leves in Mor Dhona/capital cities that award Lucis token mats. You can trade those in to Talan in Mor Dhona for Better Crowned Pie; Save up a bunch and smash them all at once with a Bacon Broth + Tinker's Calm (both HQ; might want to level up your CUL and ALC until you can HQ easily).

I got tired of the small gains from 2/3 star fish at around 90 desynth so that's what I started doing. I was only able to successfully desynth about 5 of my first 50 or so but when it did happen, I was gaining at least 1 point each time until I was ready to tackle heavensward fish.