@ratabboypda - I hope this portion helps, then see the math at the end.
In watching your video, I notice you are using a level 16 critical troop. That has a +17% attack boost (see Kerb's 4* Troop leveling chart, hurray!).
30 x 1.17 = 35.1 which rounds to 35, exactly as this post states. I hope this helps you.
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