Yes there are many groups for tortoises but there are two I really like so far. One is called "the red foot tortoise people" and other one is "redfoot/cherryhead and yellowfoot tortoise group". They each have thousands of members worldwide, I really enjoy them!
Compliments on all your research and hard work!! Have you bought a temperature gun yet? The Nubee is great and$10 on Amazon. Also please join our redfoot group on Facebook :)