Woah, wall of text.
I don't think I read in there any diagnostics on the low pressure pump. Have you checked the delivery and flow of the low pressure fuel system? When I was diagnosing my P2290-00 and P0087-00 faults I cable-tied a gauge to the windscreen wiper and drove around until it faulted to rule out insufficient fuel to the HPFP. Sounds like yours is going out under load, and that'd be the first place I'd look.
And yes, a VDO pump for a "Lion upgrade" (EU4 2.7) is the same whether it's LR or Ford. I bought a VDO locally.
MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.
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