From what i have seen from my little experience from hard training all the players that come out of it, have problems with their perfomance for a couple of games.I had a player that had it all the season.Next season he was ok...Maybe it's that,so try normal training..Maybe it's not...
As for 4-5-1V if u play the same tactics(arrows-etc) with the same players since last season,try to use different tactics to see what is gonna happen..ex.defensive ,with counter....attacking with mixed balls etc...