Testing a hotseat game this weekend with my lizard loving son, and it does appear that they are buffed too much. At about turn 125 (I am testing as the Doviello), we both have three cities. The Mazatl science rate is still at 90% with a +5 to +10 gold per turn, while the Doviello are at 60% with +1 gold per turn. The Mazatl are able to manipulate their enviroment and max out the city population with very little downturn. I would recommend at least a -25% science rate hit to slow them down a bit. I think it makes sense that they are able to be buffed from their enviroment, but this allows them to really advance fast in other ways as well. They have had three great people to my zero (without pacifism), and of course are able to jump on wonders faster, and build them faster because of their production buffs. We will keep playing until the MAFs stop us, and I will upload the first full one when it occurs.