You are still being very vague and brief. Though this time you seem to be implying that they are under-powered and die off very quickly. If that is so, then please state it more clearly. Also, Partisan only die very quickly if they are placed in the wrong place at the wrong time. What is Flash Support by the way?
On regards of German Paratroopers, what exactly makes them strong? Health? Damage? A good balance of both? What do you mean by "basic unit"?
German paratroopers have very heavy damage at any range, they kill faster than they inflict damage.
Example of the Alpha:
3 squad of paratroopers come, punish all life, one unit still takes damage (he retreats), and in its place will appear momentarily other paratroopers.
Yes they are expensive, but the Germans have no shortage of manpower.