I get a similar problem on my Makerbot Cupcake a lot as well, Generally it is fixed by holding a small fan near the print while it’s running, to cool the print (but not too much)
You are absolutely right, as low as you can. I’ve had trouble printing PLA at 200 but now you come to mention it I may be using the wrong lookup table for my thermistor.
I tend to go a bit hotter so that I can print faster and get a smoother surface. Sounds like you are doing all the right things though.
What I don’t understand very well about this phenomenon is that putting a fan on the print would hopefully cause it to cool and prevent that squishy rebound like you’re seeing, but on the other hand I thought uneven cooling of the layers would also cause warping because of thermal expansion.
its because the bottom of the print isnt sitting flat. the print is moving and your end is staying the same. so if you start your print a little closer to the bed you should be fine im sure.
I had a similar overhang curling issue trying to print the small heart gears on my printrbot. I ended up using a fan and that made a big difference. FYI, my extruder is set to 210 for ABS, but I agree with @MikeDX that temperatures between machines vary based on where and how the thermistor is mounted.