Best Way to Keep 10% Team Bonuses?

[Toxcatl]

So that means whatever training you choose, as long as it has some key attribute in it, the loss of training efficiency ("grey" attributes that it improves) will funnel themselves to increased key attribute improvement?

That is right. Let's say we have a pure striker and train him with Fast Counter-Attacks (level 1). It gives 5 XP and train Passing, Crossing, Finishing and Creativity. So each skill should get 1.25 XP. But Crossing is not key attribute for ST, so it gets 25% less XP, and this 25% goes to key abilities. Like this:



You should avoid training grey skills because they're rarely in use in this position. For example, center players rarely use Crossing, defenders -- Dribbling, midfielders -- Heading.

What's the numbers (0.67, 1.00, etc)? Multipliers of efficiency?

These numbers are experience points. I guess you've already figured that out.
You can download ITP (link in my signature) and play with it for some time =] It calculates experience correctly depending on key and non-key abilities and level of your drills. You're going to need Excel 2007 or later.

Also, how much conditions do players lose every match? (Side question: do players actually gain skills, like in training, from matches? Everybody says so but Ive never been notified in-game for any skill increase after a game or anything)

It depends on orders (pressing, marking style) and random factor.
Players do gain skills in games, you can see it in the table when the match ends. Efficiency of games is equal level 4 drills (world class, +30%).

Thanks again, you're a rockstar.

Thank you =]