Ok, yesterday did test a several settings and found a few interesting things

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XIM Settings:1. Transferred my 400 DPI settings from TF2 ST to Apex Legends ST. It seems better for season 5, Responce curve can be reduced by 4-5 clicks from the default.
2. Changed HIP SAB to 10 - and AA surprisingly stronger. I leave it there for now for further tests, but for me movement a bit affected, doesn't feel comfortable.
Finding-1 (this one interesting)When i switched to this Apex ST with 400 DPI and go to firing range - my weapons had 0 spread!! Not sure why like this. I had switched to Apex ST with 3200 DPI and the spread is big. Switched back - 0 spread. (R99 still have a bit).
Finding-2It seems Apex somehow initialize controlling devices during loading of match (my guess only, this could be other explanation) and based on it adjust AA:
1. I had entered firing range with activated dummies with my ADS synchronization DEFAULT - and AA was strong, i had switched it to Common - still same.
2. Entered firing range with activated dummies with my ADS synchronization COMMON - and AA was weak, i had switched it to back to Common still weak. After i restarted firing range with ADS synchronization DEFAULT - AA back to normal.