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Sounds like the b-tension screw doesn't have enough on it, usually you get the top jockey wheel as close as possible without touching to the big cassette sprocket in the smallest gear at the front but the big cassette 1x stuff works a bit differently. Some of them have a mark on the rear of the mech you can look through the wheel and line up with the cassette, but generally you can get it close to how you would on a older mech then dial the B screw in and further away from the cassette until it shifts cleanly across the cassette, make sure your chain is the correct length first.
snottyotter
The derailleur doesn't use the smallest cog and crunches between changes a lot