If was thinking if you have a higher goal(as in larger tfr) then that will give you more energy to pursue natalist policies. Maybe it would be harder to reach the goal of 6.0 tfr than 3.0, but even if you don't reach 6.0 tfr then you may have a higher tfr than 3.
Even Romania with their extreme natalist policies was only able to get their fertility rate over 3 (peaking at 3.68) for the immediate few years (1967-69) after the government ordered it. If Romania with their extreme security state couldn't do it for more than few years, then neither can East Germany.