for a long time, I tried switch on standard camber boards and just couldn't do it. It was only when I started riding TBT that I could ride switch and well (linking turns smoothly and confidently). I'm guessing any of the new tech boards (RC, hybrid, etc) with lifted contact points would be similar....if you can't do it on those, maybe your brain just isn't geared for switch
I just bought a regular old Burton Custom, and set it up for twin stance, and switch is SO much easier than on any directional board I've been on. I would either try centring stance, or try switching bindings 180 degrees (to make a direction board favour switch) before I'd buy a non-camber board.
But I'm a camber lover so I guess that's where that comes from!