Every tactic has tweaking points and is never 'done'. You have to tweak the tactic to your team and to match situations for the best results. For example, you need to hold the lead.. You can switch to counter, or just set all duties to 'support' or even 'defence'. I played against Manchester United with my Crystal Palace, set the duties to defence and still managed to creates chances and didn't conceed any goal. The F9 role is not the only possible role in these tactics. You can easily switch to a complete forwards or try another role. I haven't try other roles than the F9 and the CF.
If you have two good wingers than play with two wingers, instead of an IF. If you have two good IF's than play with two IF's. Or leave it as it is now when you got a good winger and one good IF.