I put a lot of effort into each match (It's worth pointing out here that I still play FM07 - but it makes no difference), I'll always keep the same formation regardless of opposition - usually 4-4-2.
I use a global mentality and depending on the opponent i'll set that to what I think is needed, attacking at home and usually less so away/against very strong opponents.
Watching extended highlights I'll pop back and forth to the tactics screen as the match progresses to alter the mentality, defensive line etc.
I pretty much change the tactic continually (but not drastically) as the match goes on.
A "dream" game would start Wide, Fast tempo, attacking, direct.
And finish off slow, narrow, deep, defensive.
And obviously with a win.
I guess I'm a hands-on manager, I like to get involved.