Just curious guys what type of feature engineering have you tried… I tried adding/deleting some features but didn’t make much improvement of the scores 
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Have you ever heard of:
- Eccentricity
- Semi-latus rectum
In my notebook, I hinted about some features with regards to the ellipse such as :
ellipse_area = 3.1451926 * df$double_major * df$double_minor / 2 # surface area of the clock
Have a look at this super rich wikipedia page:
Disclaimer: You might find some super useful features in there, or perhaps nothing, but hey, at least you will learn new stuff! 
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