Hi guys,
I had the same problem with my T500RS with F1 rim no having much/any FFB. I fixed it by going into the FFB settings ingame and bumping them all to 100%. THEN I got FFB. I recommend doing that and then droping the Environment and Wheel Weight settings back to suit your preferred feel.
As for the braking issue, I still have that. If I choose the T500 preset profile in the game settings the yeah it locks up too easy. If I create a custom profile then I get a 50% deadzone where I get no power on the throttle until about half way down on the pedal. I DID find just last night that if you're using the default T500 profile ingame but change the Brake Saturation to 100% (instead of 0) I stopped locking up so easily. I didn't get a chance to try anything lower at the time but that could be something to look at. Im using the brake mod too by the way.
Hope this helped yous somewhat.