LST - simply bending and tying down will do wonders for an autoflower and no risk of stalling it by cutting it. Every day lost is a big deal with autoflower yields.
the pellets can be awesome, i'm sure. Don't take this the wrong way or have buyer's remorse. But, they will likely be harder to dial in over time.. but once dialed in they will make for easy grows, i'm sure. The problem is predicting differences in plants yo haven't grown before.. what one can handle another will get sick over etc etc. So, you'd probably want to deduce some minimum amount ot add that is virtually guaranteed to never cause problems, but then also hve to add a dose of this or that later in grow more often based on symptoms.
sounds like those are designed for autoflowers... may be even better than what i describe and easier to use... just becareful with it. If issues crop up, i'd lean toward assuming it's a toxicity unless incredibly obvious and chekcs all boxes for soemthign else - including recent behaviour.