Hello All,
After successfully building a 3.5 inch quad, I tried to follow the @amilcarlucas 's wonderful How to methodically tune any ArduCopter | MethodicConfigurator methodology to build an indoor cinequad which is almost the same build as the 3 inch quad in the Methodic Configurator example. I did make some judgement calls in applying the parameters as an intermediate NOOB 
I am getting very hot motors during the first hovers. The prop nuts were flying off as well I have not much experience with these prop nuts, so was not sure how much torque should be applied for tightening. The vibrations are really really, but I do hear high squeal. Again, I am not sure if 8-blade have a higher frequency noise when in flight.
I am hoping not just to resolve the issue of hot motors in this blog, but also hoping that this issue would serve as a learning opportunity for those who are at an enthusiast and intermediate NOOB level .
And here is the picture of my rig.
Here are the logs and param files. Any help is appreciated, a always
3InchCineQuad