Welcome
Hi mate. There is a little description of the ratings Darkcanuck/RRServer/Ratings used in Darckcanuck server. Jdev described some of the values here Roborumble results. Maybe it helps a little.
For me the 1200x1200 (or even bigger fields) sound very interesting, i think this could lead to nice run and hide tactics. If you keen for some unusual views, you can just raise the gun cooling rate in the settings and see your robots shooting like crazy. I use this mainly for detecting energy leaks, spotting gun patterns of some enemies or checking how well the wave servers can avoid this. But i could as well think of it as part of a competition of some sort.
Anyway your results look very interesting. ShellyBot has a high score for a ram bot and if you look at the damage of Walls :). Looks like Leeroy has good roots with his high survivability if he get some 1v1 energy management or better 1v1 skills he could raise some % i guess. MarksRobot is well prepared for your competition, damage, survival and some ram are all well.
I wish you luck and fun and maybe you can keep us in the loop about your rumble :)
take care