Well, historically there may have been somthing to that. Remember before the Wonder Nine era 9mmLuger ( as then marked ) ammo was not a popular cal in the US , and Us made ammo was loaded mild , milder than CIP specs. It was a very common theme in the gun periodicals of the day for people to write in that their Lugers would cycle properly. The usual remedy was triming the spring to allow full cycling. As further data point , good friends father had a matching number P-08 , and had similar complaint.
By the late '70s as there were modern 9mm pistols , and intrest in them for LE / SD , and early JHP loads were coming on the market , the ammo was uploaded to upper end of SAAMI .
One takeaway , is if you don't know the complete history of a particular Luger , it may have received a reduced spring in the '60s or early '70s ., so a fresh spring is cheap prevention.
For the OP , just like any gun, start low , work up for 100% function , withing published data.