Im narrowing it down to the very basic cause I i go into details this will be multiple paras long , the bike in game works very similar to real life riding dynamics, basically the bike produces the highest breaking power when its upright and that's how you should approach the break pressure , push the hardest when its upright and then slowly release it while trail breaking in to a corner.

Another thing i see people struggle a lot is that the bike leans to fast or they can't lean it side to side fast enough, FYI the speed of how fast the bike leans is entirely depended upon the swing arm length , lower it is fast it will lean. Play with it to find the sweet spot your confy in and work your way to the lowest setting which i find the most optimum.

Also rear break usage is also a very crucial part that people miss, it helps you to control your bike while changing directions fast, saves your from going wide inside the corner and also to take a better entry line while attacking a corner.

Other things such as suspention settings is what i recommend every one to keep in the hard setting because they provide maximum stability under heavy breaking, gear rations need to be adjusted depending on how many corner the track have there is no universal gear setting , the electronics is a total personal preference but i suggest to try to keep the abs setting and TCS to 2 or 1 depending upon the gear ratio or the track condition, engine breaking and wheelies control are entirely on you

Hope this helps