Conscripts do not need a buff it is the other infatry that need nerfs.
This still wont change the fact that commanders that rely on Conscripts and Conscript upgrades instead of elite infantry struggle greatly late game because once your vetted conscript squad dies you are going to have a problem fielding any significant infantry.
This problem is unique for the cons since for example the MP40 Volksgrenadiers (closed unit to ppsh cons) scale way better into late game due to their better veterancy and more consistent dps curve.
Another way to bring the PPSh41 upgrade into line with the other assault packages for line infantry is to give PPSH41's but tone down the performance of each gun to m3 grease gun mp40 levels. Again, for the more consistent dps curve. Also the CP's need to be lower and similar to mp40 and sten upgrade at 0CP.