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Ok. I fugured it out. Those oscilations was an effect of those recommended Boost Low and High values. +2 is too much. Both 0 are good enough.Just apply the new recommended FFB Settings to avoid this (it's for update 1.66): https://www.gtplanet.net/forum/attachments/t598_ffbprofiles_gt7_red_1-66-webp.1498772/