You're not taking into account the fact that Fusies have six men, either squad's EHP, nor the fact that a significant portion of the Fusie's damage is loaded onto their G43s, meaning they lose significantly less DPS for each model loss (Especially before they lose their fourth model).
Raw DPS isnt a meaningful statistic by itself as far as unit performance is concerned. Test these fights in-game and see how they actually do.
Also: Are the numbers you're giving for Sections for if they're in, or out of cover? They have a different DPS profile dependent on which you're looking at, y'know.
Im not completely sure if the numbers are in cover or out of cover. But its not that meaningful cause a, there is plenty of yellow cover later on and b, their cooldown debuff/buff doesnt affect enfields that much. Its more punishing for brens or vickers. So the numbers for enfields stay almost the same.
And dmg is the best statistic to see whats the optimal range for infantry match-ups. I just wanted to point out that Füssies are not that good long range (nice ingame description btw) and you shouldnt use them like Obers or other lmg squads. Their advantage is the excellent moving acc/dmg and their dmg around range 5-15/20. The dmg of their g43 is almost the same as volks k98 at range 35 btw. So having 3 g43 with 3 models left is no big advantage.
Edit: About the next balance patch.
I heard that some balance team member suggested to buff their k98 and nerf the g43, so the squad is better early on and the same later on. But i dont think power creeping them into viable status is the way to go. The problem is that Füssies are more or less the same as Volks. Midrange squad with snare for early/midgame until Obers arrive. In Theory there is no reason to get both. Either Füssies are better and you take them all of the time or they are worse and you dont take them at all.
I suggested to give volks mp40 instead of stgs stock. That would give Füssies a unique role instead of slightly better/worse volks clone. But i dont think such an heavy base roster change is doable anymore. So why not take Füssies in a different direction? And cause Okw has enough powerful, expensive combat squads like Obers, Falls or Jli, why not go in the other direction? Cheap, utility squad like Cons or Osttruppen. Nerf the dmg output, put the flare behind vet and put them around 200-240 manpower with slightly cheaper reinforce.
Now Okw has some cheap meatshield units. Could be problematic in 1vs1 though (see Osttruppen).