I'd say dm5 is a VERY wise choice on awayserver as it's pretty easy to keep the scores down. Bad choices would be dm1, dm6, dm8 where it's more or less impossible to win away unless there's a significant skillgap between the teams.
home/away is merciless on these pings, what it comes down to is the amount of frags in the first two maps. Picking map with care is of course one of the keys. However Croatia did deserve this win, so ggs!