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Looks like a lotta work.
A 2 percent or so plumbed pvc pipe system with holes drilled in it, laid near the bottom of the gravel, with outfalls, might help drain the water and relieve pressure even better. Particularly after a few seasons of silt up.
I have a black French drain pipe with a silt sock buried at base and covered in gravel, routed slopes to exit at each end of side walls.
Silt cloth up the wall and 95 percent gravel backfill.