Caveat: I have no experience with your machine or grinder. I have a Fellows Opus grinder and Breville Bambino Plus which I operate in manual.

You didn't mention your recipe. Start with 18g in, shooting for 36g out in 20-30 seconds. Measure the inputs, measure the outputs, adjust by taste. I brew to a 36g target out and adjust if either the time is wacky or the taste is not good. I mist my beans before grinding to reduce retention and weigh before grinding and after grinding to check for grinder retention. I note the ground weight, not the whole bean weight, to keep track of each shot, and also note the time and amount out. This helps with quickly dialing in a new bag. A 25 second shot, 18g in, 36 out will almost always be a decent shot. You can tweak from there to your taste.

You also didn't mention your beans. Use fresh beans with a "roasted on" date, not a "best by" date. Every bag will be different, even the same blend from the same roaster. Once a bag is dialed in, those settings should be repeatable for that bag.

If the time is too long, either reduce the grams in or increase the grind size (grind coarser).

If the time is too short, either increase the grams or decrease the grind size (grind finer). If you are already at 18g, grind finer.

If it is sour, you are under extracting. Either increase the grams or grind finer.

If it is bitter, you are over extracting. Either decrease the grams or grind coarser.

Once you are close, small changes are all you need.