Very nice job so far, On the precipitation I too have some doubts about those, I do not seem to recognize any major rainshadow effect or may be I am misinterpreting the color code map ?
As for the size f the earth as long as the earth has the same or similar composition making a planet a superearth would keep still the same natural gravity because the surface despite the increase of the mass would be at a maor distance from its nucleus the formula for calculating a planet’s surface gravity: mass divided by the radius squared. That is, SG=M/R^2. If you express mass and radius in Earth units, you get surface gravity as multiples of Earth's as the greater the planet’s radius is for its mass, the less dense it is.
source
https://phl.upr.edu/projects/habitab...lanets-catalog