Help anyone?!?

A couple weeks ago I bought a Model 16 in 7mm-08. I love everything about the rifle and it is extremely accurate out of the box. My problem is chambering rounds. I can never get 4 for 4 feeding - sometimes 2 or 3 rounds (usually the middle rounds) will not chamber without backing off the bolt half an inch or so, then forward to chamber the round.

I contacted Savage and they send me two magazines and it did NOT fix the problem.

I've scoured the internet and found this is not a unique problem. Some take the magazine apart and stretch the spring, while others have sacrificed the 4th round (which I would gladly do) and installed two coil springs to replace the OEM "Z" spring.

Has anyone else had this problem? How did you resolve it? Is there an aftermarket supplier that makes a better magazine?