The ammo loaded today is not hotter than German WWI and WWII ammo. No stronger springs are needed. Years ago, U.S. ammo was loaded weaker than European ammo, and this, along with poor quality aftermarket magazines, might have been part of the reason the P.08 got a reputation as being ammo sensitive. In addition, most pistols from that era will not function reliably with hollow point ammo.

A P.08 used with full powered, FMJ round nosed ammo, and a magazine which meets specs, will function reliably.

Edited to add: The P.08 is surpassed only by the Colt Python as the most over-rated gun of all time. I have owned examples of both; all are gone, with no regrets.