Vibration levels for PCBs

My company has set up two rugged random vibration levels for our PCB products. Level 1 is the MIL STD 810 Minimum Integrity Test, 0.04 g^2/Hz for 50-1000 Hz, then .04 to .01 from 1000 to 2000 Hz. Our Rugged 2 is the same frequency profile as level 1 but has an ASD of 0.1. We have had some problems with I/O connectors at level 2.

I've noticed other products that are rated for severe vibrations on the order of our level 2 are usually conducted cooled boards, thus having additional support structures. Also sometimes the frequency range is reduced from our 2000 Hz, which greatly reduces the rms g.

Given that we produce boards that may end up in different enclosures and thus have no control over how they are mounted, my questions are:

Is our rugged level 2 too severe for PCBs?
What is a more realistic profile for PCBs?

Thanks