Finding young talent, and not paying through the nose for it

I love the new judging potential system. Before 1.4 and the reset, if you had JP level 5 you could run a search for any players above a certain potential ability. If you were one of the first people to get to JP5 you had almost a free run at high-potential players (at least, the ones who weren't blatantly going to be amazing from their starting attributes). But as more people gained the skill, it came down to whoever had the most money to chuck at the player, leading to massively inflated wages for young players.
Now - under the new system - everyone can judge potential from the off, but learning JP skills decrease the time it takes to learn a players potential, as well as increasing the accuracy of the assessment. This leads to a free agent market with less competition for players, as it comes down to which players each manager chooses to assess rather than just inputting a minimum potential into a search filter. Many managers develop their own searches for talented players, focusing on key attributes for each position. I'm no different, but I try to find a balance between the right attributes and a player who no other clubs are interested in. This normally involves 'softening' the search criteria, ie dropping some minimum attribute requirements from 15 to 10. I'm going to use this post to demonstrate some of the filters I have used, and the players I found as a result.
The first key attribute for me is Jumping. As can be seen on this superb blog www.fmlnumbers.blogspot.com, Jumping is a key attribute for most positions on the pitch. Ordinarily I would search for players with 15 for jumping.
After Jumping, required attributes vary between positions for me. I've listed some of the keys for each area of the pitch below.

Central defenders
Strength, tackilng, marking, positioning, work rate, concentration, acceleration, pace, bravery

Full backs
Marking, tackling, crossing, dribbling, work rate, teamwork

Central midfielders
Passing, teamwork, work rate, creativity, flair, composure, natural fitness

Strikers
Acceleration, pace, composure, finishing, off the ball, strength

Note that I have only listed the attributes I look for in players who fit my narrow 4-3-3 formation! The key is not necessarily to stick all the above attributes into a search filter but to mix and match to compare search results. My idea was to find players who were strong in some areas but slightly lacking in others - giving me more chance to sign the player without competition and back the player to improve given competitive match experience at a youth level. As you can see from the screenshots of example players above they are swimming in green arrows. I only have basic coaching skills so I think this shows that there is no substitute for match experience - but ONLY at a level at which the player can play well. Players playing above their level will suffer from bad ratings and development will become stunted.
Now I'm not saying that these filters I use are definitive, feel free to experiment yourself with certain attributes. The key, I stress again, is to allow a little more leeway to expand the search results to include a few rough diamonds. There are definitely better youths in valderrama than the guys I possess, but these guys have got me to number 1!