I'm pretty sure this may be the large hill at the bottom of Burntrock Lake but maybe someone else could chime in. The view is looking west across Whitewater lake from location 16U CB 38163 34095 and this has to be on of the highest points in Wab.

The red line is the route coming out of Greyson Lake.

There certainly are several hills at the SE end of Burntrock that are over 400M on a topo map. I can't tell from what I have which hill that may be. But you're right, it is a very high point.
You could try asking Mr. Lawr at the park office. He, or his staff, probably know.

I'm pretty sure that's the high point below Burntrock Lake after checking Caltopo. It's the only place that's > 1400ft. I'm wondering if anyone has climbed up there. It would make for a fascinating view of the entire park on a clear day. Unfortunately for us, we were not able to explore Burntrock due to extremely high winds after our drop-off. I'll have to find the contact info for Mr. Lawr.

I'm guessing the highlands over in St. Raphael Park on the Miniss River near Hooker Lake.