88
<terrainResistance>1.2 1.5 2.5</terrainResistance> (stock)
<terrainResistance>1.1 1.4 2.3</terrainResistance>
87
<terrainResistance>1.3 2.1 3.4</terrainResistance> (stock)
<terrainResistance>1.3 1.7 2.7</terrainResistance>
E-75 drops from 1200 to 900 horse power, 25% drop, which means that if terrain resistance is calculated like friction (horse power/resistance) then resistance drop must be same to not make it a nerf for mobility.
Stock: 1.2, 2.1, 3.4 now multiply by 0.75 (25% drop): 0.9, 1.575, 2.55.
Upgraded: 1.3, 1.7, 2.7, take away 25%: 0.975, 1.275, 2.025
Now compare it with 8.8 values:
Stock suspension: Road - nerf, Dirt - buff, Swamp - buff. Not bad.
Upgraded suspension: Road - nerf, Dirt- nerf, Swamp - nerf. Bad.
So there is your answer: "If its a German, its a nerf."