I'm not entirely convinced but I think that the Vacuum generated in the pan (which increases with time and RPM during the pass) may have something to do with the oil pressure dropping as I think the sensor "sees" pressure relative to atmosphere ??
Dual line and an accumulator, aIso run a long sump too, but modified for steering link clearance. A class we run in, required "stock type" suspension. Though I'm sure the rules are open to interpretation as there is a mopar with coil over front suspension competing now