Excellent tactic, I switch between V4/4.1/5 depending on the opposition and have made several tweaks to the defensive aspect to tailor it to my team.
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However, I've been very lucky in that David Silva, Pjanic, and Carlos Tevez were unhappy, transfer listed, and thus available for 9-16 GBP in the second season where I had plenty of money to grab them on the cheap.
Definitely among the best tactics I've used, and more consistent than most too.
Are you playing with the new patch?