1911 spring trick for M9

ok....after another trip to the range with M9 and a failure to extract/jam, followed by failure to fire...think the sldie didn't go fully back into battery.....i'm looking for some info on the 1911 plunger spring trick for beefing up my extractor spring. Can anyone shed some light on this. Exactly what spring should i be looking for? does it fit inside the existing extracto spring?

or should i be planning to send this in for service?

actually one of my better outtings from an accuaracy point of view, but i'm losing confidence in the reliablity, i get a problem almost every time i take it out.

thoughts?