How to "convert" a League mod into Historical performance mod

Hi, I have some F1 mod but only LE versions ... I would like to modify them in more "historical" version for offline racing ... I do not like a Coloni to be faster of a McLaren (killing immersion) ...

I am not an expert to mod the mod :) but maybe some suggestions to modify them in that way with a few/easy parameters ? I know it would not be so easy, but I have seen in the skin-mod for classic 1998 F1 cars the modder wrote that he only changed some parameters to have "the McLaren will have a bit more power, be capable of braking later into the turns, & be aerodynamically more efficient, while cars further down the grid will be less capable in these areas".
May you please tell me which parameters to change and where to have those effects ? I mean to reduce power, braking later and aerodinamics ?
 
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