Wow, that doesn't sound good Rhythmic. That mount is stated to support 175lbs so it is really worrisome that it is bending with just 75. I hope your second fares better. I'm supposed to get my mount today, and your experience, more than anything else I have read, makes me a bit timid about hanging $1500+ of merchandise on it. I am gonna try to hit 4 studs for peace of mind.
OT:My Monoprice HDMI switch turned out to be incompatible somehow with my low-end Dynex hdtv, but it works great with the new 60" plasma so I can't complain.