I attempted to calculate the average suppression of each Machine Gun using the formula Suppression Amount x Rate of Fire Mid x Accuracy Mid. If anyone has one that's better than that, let me know because that formula did not give the correct DPS values that were on the chart, but I think it's still indicative of which number is higher. So here's the higher numbers:
0.14904 - DShK
0.1485 - M2 Browning
0.0875 - MG 34
0.0864 - MG 42
0.064056 - Vickers
0.0468 - Maxim
While I applaud your efforts, another major factor is going to be burst duration, which doesn't look to be a factor here. ROF is only half the story, as none of the MGs fire continuously (though the maxim can come close in that one regard)