Glad that helped, Kylos. Still waiting to hear from Jackers, though.
In my experience 4-5-1V is one of those formations which relies on really good players in key positions. The defensive part is strong and takes care of itself, it is the offensive part which is the tricky bit, and I really didn't get on with 4-5-1V until I got a couple of strong wingers (see this post Special Skills discussion) - with these wingers I can almost put any striker in at the front and the attack flows to the extent that I have about 90% success against any formation that is countered by 4-5-1V.