1.the tactic doesent help you much and
2.Your strikers are old and they have unpleasent nationality,try czech,italian spanish brazilian and many others as strikers
3.If you want many goals,play 4-3-3 is the best offensive tactic.
Hope i helped...
nationality does not affect a thing. and if they are getting a lot of assists then do not worry about goals. If your team constantly loses though you might just want to sell them and get different players.