In both directions. Very poor mentality can result in 10+ points being lost from stats and very high can be 10+ points added. This is utterly absurd of a range considering the "effective" skill range of drivers and staff is 80-100. So you can have your stats being cut effectively in half, or being doubled. This has led to Stroll being a god, and Alonso being garbage, because they have a midfield car/team. It does not make sense
If you have a decent to good car and facilities, it's better to take staff that are around mid 80s, as the boost they will get jumps them up to being the best in the field as they expect mid/low field quality and you're giving them far better than that. Meanwhile the top staff/drivers will see minimal to no benefit from this, or worse, if something is not quite the absolute best, they'll suffer from it. So it's better to keep your staff less than ideal so you always get a decent boost.
This should be cut in half, the absolute most the deviation should be is +/- 5 points. This would prevent incredibly wild and nonsensical swings like bottom drivers being top drivers and vice versa, and would be minor enough that it's a choice between "less than ideal" staff and the top staff and stay fairly balanced. While ensuring that a team on a good run and a team on a bad run do have at least impactful morale implications from that.
