The oil pan is a stock mopar tin pan no baffles and yes there is a windage tray. the engine ran great at the begining of summer good oil pressure lots of power. now it seems to have lost some of that when all this stated to happen
I'm suspecting that the hard acceleration loss of oil pressure was happening from the beginning and it just got not noticed resently, either way you need baffles and the stock pan will take 5 1/2 litres with a dry filter. Have you got some info on the oil pump like model number. What was your original hot idle oil pressure at the beginning of the summer.
One last question, what was your cold idle oil pressure and has that changed.