I have actually some optimizations on the 4-5-1 V style Defensive as i've used it last few seasons on the new version.
4-5-1 V Style- GK
-DL DC DC DR- DMC-MC MC-
ALM AMR-ST:
Team Mentality: Defensive
Focus Passing: Down both Flanks
Force Counter-Attacks: Yes
Pressing Style: Low (Own half )
Tackling Style: Normal
Passing Style: Mixed
Marking Style: Man-To-Man
Needless to say that Man To Man works better with defensive mentality as your defenders will mark any player that gets in your half and not just cover their zone even if it's empty.
Pressing own half works better on defensive tactics since the new update.
Using mixed passing instead of Long.. i can't see much difference but it's defenetlly increasing the possession on the ball so i changed that too.
Blue arrows on all defenders keeps them on defending side and would avoid situations when you'r defensive line goes high and some of the DC believes he's an attackers... then u'r not covered when the opponent counter attacks.
Training bonus on Defence with 4-5-1 Defensive works good. i usually use Defensive bonus 1st half and Posession bonus on 2nd half
Those are the settings on my team. Usually building balanced team with same average quality on Defence, mid and attack.