Ok..thanks for your feedback ;) It is actually known problem from earlier setups which corrected to choose softer tyres but it shouldn't be anymore problem with this setup though.
Maybe you can try to change rear tyre pressures softer and maybe lift rear more up...or change driving style little bit of those corners. Fun fact is that if we change one or two things then we have to change 10 more...
So at this point I won't change this setup before it comes topical again.
Good luck!

i'm losing the back end in crucial corners with this one