I think it is more than clear what the problem is. Find a car with a working 175b valve and change it for a test...

Hm, do you have some pictures and how is possible to find reference position ?

In the images below u can see the cam lobe and its alignment.

In some 2.0tfsi engines the lobe is integrated with the camshaft.
In that case it is impossible to lose its timing.

i make almost same setup
rs3 inj bigger cam lobe with roller
175bar prv

never any problem high rpm misfire  or jerking
onyl little over pressure because i use AKS prv and i think faulty not opened

what kind of position fitted the injector ?

but i found one injector test with continental s5 or s4 injector and this injector above 130  bar less flow rate

I had repositioned RS3 injectors like they are in RS3. Generally my car runs now better on 4.0 tfsi injectors vs RS3 i mean no more black smoke or gas smell, nice cold start etc. but i cant even rev on neutral cuz all cylinders will missfire and rpms stops.
You can see on the logs that when you try to WOT it will stall around 2,5-2,7 rpm, lambda will go to 1.99 and rail pressure 20b over the commanded pressure. I dont know if its my car or we just cant calibrate injectors...
Im trying to get it running cuz i have big turbo (G30-770) setup ready to fit but if i cant get fuel there is no point in changing turbo. If i manage to make it work then i can change turbo and get it tuner properly and im happy to pay for that