First of due to the fact that with a combined braking system(your LT trigger activates both front/rear braking) the rear brake has a linear increase with your analog stick, you will want to change that to split by game settings-general settings. You will gain control of those two in a separate manner, so thats what you want anyway.

Then, moving on to controls:
* Throttle=RT *
* Front Brake=LT *
* Rear Brake=RS down, which means that you can now modulate your rear braking input and do that separately(since we changed that to split) *
* Tuck in= RS up, which means you can now adjust how much of a tuck in motion you want to give to your driver's model, without having to use LS up which can be confusing as you can easily steer your bike as well with that analog stick, and end up overshooting corners or misjudge them
* Tuck out= LS down, cant do much about that unless you want to use RS left-right but it can be confusing nonetheless (we only have 2 analog sticks to work with and that many functions) *

With that being said you can now manage your Tuck in and rear brake in a seperate manner which can help you dedicate yourself on both of those keys without other inputs in the way.

Clutch can be used as well in one of the above, but you will either have to sacrifice your full control over tuck in or rear brake, which i dont recommend because you spend much more time on tuck in-rear brakes and its not useful anyway.

Look left/right and look front/rear can be set to a key/keys.(i think its worth the sacrifice as you get 2 much more important inputs set to those keys).

If you've never played this way, it will take some time to adjust but on the contrary, you now have much more important, dedicated controls to work with.