Mauser Bump or Hump

Can anyone explain to me the real thinking Mauser had when they produced their early Lugers with the No Mauser hump and then some were intermixed with the Mauser hump and finally all were produced with no Mauser hump? It seems to me the recoil travel of the toggle link would be different between the Lugers with the hump and without the hump. The reason for my thinking is the frame lengths are different. Is the toggle rear movement stopped by the inside of the frame or by the knee on the rear toggle at the back outside of the frame?