To try to make a time line of rf2 tyres is like try to make the same with the human race, there is no line, it's like a tree.
There were so so many changes on the tyres that's difficult to make a list. Since CPM tires were introduced there has been several changes. You have the early ones, then the ones at the DW12, later some variables were added, the important CAP changed all again and finally the lattest QSA and more variables.
Since build 1110 ttool gives a different lookup table result than in previous versions if you run a complete test. That's because a correction made to sort an old mis calculation.
About FFB in relation with the tyres, you have to see the contact surface. The old non CPM had a big and square surface, it gave a strong force all the time, but there were few sensations. Then with the first CPM tyres the contact patch become a lot more narrow, more sensations but less force, so the force was increased through the HDV. Later the pressure on the patch increased with CAP and with the change since build 1110 making the tyre carcas more stiff.
Latest tyres have a lot more base grip, more stiffness but they have micro loss of grip to bring more feedback.
You can't put a newest tyre on a car developed for an old versión of tyre, you have to change many things on the rest of the car or the result will be crap.
This is the story of rf2, an endless bunch of changes, poorly and outdated documentation, tyre examples unfinished etc etc that make it really frustrating to work with.
