I'm no professional camper, but I did take a tiger out the other night. Lost the first 2 to direct frontal hits from Panzers at ranges between 800 and 1200, and the third to just a few hits- I heard a few impacts, 1 loud, maybe 2 softer richochet hits. It was the map with no Shermans enabled, and the only 2 vehicles I'd seen were T-34s and Panzers, so it was presumably one of those.
There is certainly a noticeable difference in the GVs (with the Tiger being a real weak link now) since the tweaks from the more recent patch, but whether this means the tiger was ridiculously overmodelled before, or is too vulnerable now is purely conjecture.
As far as the bouncing round, I have a really hard time believing that. I've never seen a GV round ricochet or bounce off of anything but another vehicle.