[uruguru]

One thing you can do is turn off the trading deadline day feature. Not only does that increase activity, but it seems to slightly lower the difficulty so that the players get offered better deals than they would otherwise.

Another thing I have tried is dynamically adjusting the difficulty. In the off-season, I set it to "Very Low" because there always seems to be a massive unrealistic spike when the off-season starts. Then I bump it to "High" for the Winter Meetings. After the meetings, I keep it at "Low".

A month before the trading deadline, I set it to "Normal". At that point, the game's internal logic automatically ramps up the volume as the deadline approaches.

I have no idea if this makes anything more accurate, but I enjoy playing with the knobs a bit.