forza 7 and horizon 3 texture glitches

Hello Community, long time AMD user here. (9800 Pro, x1950xt, 7870, R9 290x and now RX Vega 56).

I have Problems with the Drivers in the Forza games ever since 17.10.1

I tried updating to the new FCU as well as downgrade to the previous Windows version (with all possible combinations).

When I try to load into Forza Horizon 3 it takes about 5-7 minutes to load into the game with the drivers since 17.10.1, if I succeed in loading it up, I get texture pop ins or just blank spaces.

With Forza 7 I get texture disco, meaning some textures wont load properly and I get weird color glitching.

All these Problems vanish if I use 17.9.3 and below, but the newer drivers seem to handle the GPU better in general, as they seem to not switch p-states as often and handle the load more consistently.

My PC specs are:

Asrock Z77 extreme 4, Bios version 2.90

Intel i5 3570k

12gb Corsair Vengeance lp ddr 3 ram  @1600mhz

Rx Vega 56

Games are installed on a HDD (tried a different one to no avail).

Hope this entry makes someone aware of the problem (if they are currently not).

Thank you very much for reading.