I have a very similar setup; 2902WS with a F250 SRW. My E2 was doing the same thing. The spring bars are tempered to give them, well, 'spring'. They are harder than the brackets and the brackets will wear. That's part of the design, the brackets are somewhat sacrificial. As IchLiebeBier mentioned, make sure the spring bars are parallel. This will not only spread the wear over a larger area and slow it down, but it may also increase the sway effectiveness. I've seen some plastic snap-in wear plates on Amazon and I've been tempted to try them but I think they will reduce the sway control friction.
2019 Rockwood 2902WS
2019 Ford F250 4X4 CCSB 6.2/4.30
Equalizer E2 with single old-school friction sway control.