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So this was my mistake. I was testing MG's at 35 range which is not their max range. Their max range is 45 and this was the range that the numbers I posted earlier applied to. At this range, the numbers do add up, the maxim does suppress in over 4 seconds and the Mg42 in just over 1 second.
The maxim's rate of fire does increase proportionally higher then the MG42 with a decrease in range, but even at close range it has barely half the suppression rate of the MG42 and at relevant distances 1/3 to 1/4.
I also checked the vickers, and it does indeed suppress in over a second and a half.
This in mind I have two possible suggestions.
The first is to simply increase the suppression value from 0.0065 to 0.01. This will change the long range suppression time from 4.27 seconds to 2.8 seconds- still 2.43x longer then the mg42 and 1.65x longer than the vickers.
The second is a bit of a larger change and its to increase the rate of fire at long range from 7.2 to 10, mid range to 13.4, then reduce the burst duration long from 4.5s to 3.2s, and at mid from 3.15s to 2.5s. This will change the suppression time at long range from 4.27s to 3.1s and at mid range from 2.56s to 2.29s. The suppression under this change wont be as strong as the first option but the dps at long and mid range should go up somewhat compensating for poor suppression with higher damage.