At work I don't have the time to actually play the game, but I can perform some tests. Considering that you were frustrated using 343 watford v2 with West Ham, and after my Tottenham test yesterday, today I decided to conduct a West Ham test myself.
The same rules as yesterday:
No transfers.
Quickpicked the team every match.
Only actually played the league matches, in commentary mode.
All the other matches were played using instant result.
Only made substitutions if forced to do so by injury, or if a defender or midfielder got a red, always removed a striker.
Again basically my job was to hit the space bar!
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As you can see in this test I got trashed a couple of times by the big teams, but even so with proper management, a few buys, I think West Ham could challenge for the premier league title!
My advise: persist, keep morale high playing friendlies against very weak teams, don't get ****** if trashed by a big team, persist, at the end you will get your reward!
I admit it is very difficult to say one tactic is THE BEST, but honestly with 343 watford v2 I feel in control of the game, a control that I did not have in the FM series for some years now!