You guys might try PET filament instead of ABS. It prints at a little higher temperature (240-250C or so) but not so high that it would be out of range for your hotend I'm guessing. I don't have a Flashforge (I have a Makerfarm thats heavily modified) but I've almost completely switched from ABS to PET. PET sticks very well to a warm bed (around 50-60C), does not have any odor, and does not warp at all. It comes in colors too. You can't smooth it in Acetone like ABS but I find that I hardly ever smooth anything. If you need smoothing, it can be done but do your research because the chemical used is much more toxic than Acetone.

PET sticks so well that I'm guessing it might also solve your warped bed issues.