Welcome back!
Thanks for the feedback and I'm glad you're enjoying the mod. It seems like a lot of my changes are having the intended effects.
Its a shame you dislike the driver trait system, even in its current form, it throws up some interesting circumstance.
Things such as the Neck Problem debuff is actually designed to by 'Crippling' - it was a design choice to make it so powerful and for so long. I'd like to change the title to "Sever Neck Problems" but I've realised that the 'text' (both title and description) is actually a graphic file - one where I don't know where it is. As such, I cannot change the 'meaning' of the trait like I originally desired. Additionally, I wanted those particular debuffs to really impact your yearly strategy - i.e., if Perez gets '(Sever) Neck Problems' then it's likely he's not going to be able to compete in the races at all, and that the player should promote (temporarily) the Reserve Driver to take his place. This is done to try and give the Reserve Driver a role, as commonly its simple to play though the entire game never having a dedicated reserve driver (excluding the $1,000 a race rolling contract 0.5 star ones) which can save the player a mass of money.
In short, it was meant to ruin Perez's season. It was meant to be a random event which makes the player move to (or create) a contingency plan. I feel the main issue is, is that the severity of how I've changed the debuff isn't explained to the player, as its stored as a graphics file beyond my reach.
On the other hand, the issue of another buff causing "Magnussen/Sainz turn into Michael Schumache" is only really a bad thing because you're looking at real names, and looking at the chances that this would happen in real life, realising that its less then 1% and thinking 'that will never happen'. It's less of an issue when you see these all as just 'fictional' names, or you accept that really anything can happen in the game. I always feel that Kimi Raikkonen was just a 4* driver, who was in the best car in 2007, and had a good 'Buff' to bring him upto 5* for that season.
But in conclusion I can see your argument too if you're trying to play a real life mod. Open the Personality Traits in Excel (as a .csv) and have a look at them all. There 277 traits and you can adjust everything there. Feel free to make and share an alternate PersonailityTraits.txt with us, and I'll add it to the Modded Texts folder in future versions, for people to import as an alternative.