Whitefish/cross has been a puzzle that I’ve been trying to figure out for several years now. There seems to be equal success in fishing a weed line near the shoreline drop offs as there is out on the reefs. The biggest thing I can recommend is that, regardless of your location, be ready at the sunset window. There is definitely a flash bite and if you miss it, your chances of hooking up with a walleye go way down. (I have not fished late night, so no info there) Typical clear water walleye tactics work here. Pike, Whitefish, Tullibee, and Eel pout are likely bi-catches as well which is fun.
As for access point, I would recommend the boat launch on the NW side of Cross lake. There are roads plowed out there that people have made for their own access for free, so please be respectful. DO NOT drive anywhere near the entrance to Rush as it has open water or anywhere near the dam as that is likely thin as well. Not sure where a good place to access Whitefish with a wheelhouse.
Let me know if you are going to be a constant in the area and we can start to exchange info!