Just so you know there's a flaw in your "guide".
Smaller maps = more lag, not less lag. Bigger maps means more space to move around so all the fighting isn't taking place in one spot, while Junk Flea is all in one spot pretty much because it's nade/NX noob city basically which causes you to lag, not to mention hackers choose it because of the size making the lag enormous.
Gray Hammer is one of the best maps to choose because it's big, but it's also small. Let me explain; Gray Hammer, in the beginning you're either on Alpha or Bravo side, Alpha is a small discreet area so is Bravo, but being on Alpha does give you some advantage, same with Bravo. Both teams have a choice to either go into head on battle or choose a long route to head into battle. Elimination round with 140 kills can get you around 300+ exp per round, yes other games can give you more exp but Elimination raises your KDR (Kill/Death Ratio) and the more kills you get the better because even though you can get fast exp, it's better to LEARN to kill rather than going around getting killed and getting exp for it.