Some schooling type helmets that fit more on the oval side:
Ovation Deluxe Schooler
Troxel Intrepid
Depending on which Charles Owen model you have, possibly a Tipperary Sportage.
Other ventilated helmets that cross into the show ring: IRH IR4G and IR4G XLT. I did not personally love the fit of the One K, even in the oval shape and I have the same feelings about the Samshield helmet.
The GPA Speed Air, at least the older model, was a pretty good fit on me as well. But full disclosure, I never rode in it, just tried it on in the store.
An AyR8 in the best fitting helmet I have owned and so far I’ve tried on 3 MIPS helmets.
Charles Owen MyPS was a no go for me because it was too deep for my head and covered my eyebrows almost entirely.
Trauma Void Lynx was also a no go. It was not quite as deep on my head as the MyPs, but was too round. It fit ok front to back, but gapped on the sides.
I have two Trauma Void Eq3 helmets which I like the fit of. However, depending on the shape of your head, some people find it too be too shallow.