Second chance Lugers

Please advise. I've got an Erfurt 1918, bolt doesn't match, all else does. Chambers fine by hand, shoots, ejects, but stovepipes every time. Magazine spring seems strong but magazine is a little loose in the well. I pushed up on magazine while firing but it didn't make any difference. Where would you start? I will try the rubbing compound, that would mean the toggle is dragging to the rear and not going back far enough. What's next?


Thanks

Roadkill