If you had to choose between nutrients and feeding your plant more Co2 which would you choose for the health of your plant. Consider that you have good organic soil too.
to me air exchange and proper exhaust etc is #1 you could have the best lighting and nutes, but if you're running at 90+ degrees with stale air, then you're gonna grow shitty plants.
I'm not experienced with cannabis, but with aquatic plants, nutes will do almost nothing if there isnt a good oxygen (night) and co2 (light) combo. Once co2 is good thr plants will suck up nutes like mad. But maybe cannabis is different.
Assuming everything else about your grow is On Point, and there are no issues, then; nutrients >over C02 boost. thats not even a question. Like sleeping blade said. do both. BUT DONT OVERDO either one