Diffuser needs a curve, not flat-plane. You are trying to replicate the top surface of an aircraft wing. You "need" outside fences aligned fore/aft with the longitudinal centreline of the vehicle - just inboard of the tyres, so that "wash" around the inside of the tyre does not create turbulence in the diffuser
Would probably help to install maybe 3 or 4 more strakes to channel air as well.
I'll post a photo of mine to make this verbiage clearer.
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