Not sure what level you are playing on, but I've managed to get some deep passes to Bernard Berrian and Mushin Muhammed in my Bears franchise. Some of those have come with the DB close to the WR and either the pass going over the shoulder or the DB missing his swat. This is on All-Pro with Knockdowns and Def Awareness lowered. I think throwing deep is actually easier than it was in the last couple of years.
As for the turnovers, mine are not really the issue. Fumbles are a pain at times, but seem to come in bunches. 70% of my picks are probably my fault, and I can live with some of the superhuman AI picks even if they are annoying. Instead, as others have said, it's:
1) The CPU turns it over too much, especially with fumbles. This seems like it would be a relatively easy fix -- make it so the CPU doesn't fumble as much!
2) Too many CPU turnovers lead to human TDs. I'm 9 games into my Bears franchise and I have 7 defensive TDs. This is much more difficult to fix. If the CPU QB throws an out that my CB jumps the route on, he should be able to take it back for a big gain. And, as any Bears fan knows, professional QBs do make some incredibly bone-headed throws. The issue is, how to make the CPU QB not throw that pass as often as it does, especially with elite QBs who should know better? That's a more complicated AI question that seems beyond the means of a patch.
I have a feeling if #2 is addressed in a patch, it's going to be that DBs will be dropping those picks instead of catching them. That will not be as satisfying as better QB AI, but it would restore some balance to the game.