I think it's clear original movies do better when there are no big blockbusters to suck up the money. This March there was KFP4, Dune 2, and GxK still coming so audiences probably saved their money for those movies. So audiences weren't willing to pay for dumped original movies like Arthur the King. Even still Immaculate opening is pretty good for a small distributor.
If you look over the Holiday season, when there were no big blockbusters, the original movies did a lot better. The Boy and the Heron did very well, ABY did great, and The Boys in the Boat and Iron Claw also did well. Even Beekeeper did pretty well on MLK weekend.