Sorry for the bump, but I'll have 2 important games wich the opponents are using 4-5-1 flat and in the thread of "Table of Counter Formations - What to use?", says the best formation against is 3-5-2 Flat or 3-5-2 V-Style.
By the screenshots above, it seems 4-1-4-1 give us a better results than 3-5-2 Flat or 3-5-2 V-Style.
I need some suggestions/advices from somebody, about wich one I must to use.