ok, i managed to find some good improvements to the Brake-FFB, Understeer-Effect together with the Tarmac-FFB. There seems no Gearchange-FFB at all at F1 2016. But for Formula1 Cars with paddles it's not really so important imo.
It's not a top-notch FFB known from the major Sims out there, but a major improvement to the default weak FFB having a better feedback on what's happening on the road and to drive more consistant laptimes.
Thanks@Schu for testing the files. I will upload a file to the download-section with various settings soon.