I'm not sure what you mean. I pull the bottom sheet out, flip it over, put it on the top, and gently push it down to submerge it. I just keep doing that continuously. This way each negative gets pushed into the developer face down and face up, alternatively, over and over again. The process continues in the stop bath and fixer. You never stop shuffling. A moderate pace is all that is required. There is probably a video on Youtube which show this.
If you get uneven development then perhaps two sheets got stuck together early in the process. Presoaking (with shuffling) for a few minutes in water will prevent that. (Even if they stick together in the beginning when immersed in water, it doesn't matter.) Insert each sheet separately.
Using an infra red viewing device makes all of this very easy, and you can watch development proceed.
The tray or tank should be deep, not wide. We want less oxidation and more coverage.
To avoid neck strain, adjust the height of you developing area to your height and arms. When I get home I'll put a picture on my site of the special high-tech device I use for that: plastic seed trays
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