How do i practice to make Soroban s visualization stable?

hello everyone, i have a question consider to the visualization of the Soroban, i worked on flash Anzan lately and it’s fun to do, my visualization is getting better while practicing on flash Anzan, and also by doing some examen kyu sheets, i try to repeat the calculation that i did on soroban in my head, the problem is i still not see a stable image when i do 2 digits numbers calculation, i feel like i’m too slow to learn that. I can see the number clear in my head but once i add another number to it, the image doesn’t look stable especially the second rod. how should i practice that? do you think working only on the real soroban is enough? i practice 2-4h per day, and started 1 month ago, even i learned soroban in 2012 but i stopped unfortunately.
how can i make the practice effective? Thanks!

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I will take a while.

Thats it, only time and practice will help you.

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