Okay so i'm going to be kinda a critic but only for the better of things.
I would suggest having at least 3 lanes, a few less jungle creeps, and a bit of a smaller map for the following reasons.
1. Lanes are needed to keep balance with the champions and to help give vision of the opposing players. If you have few lanes stealth champions will be OP and Ranged AP champions will be under powered. Having vision via lanes also makes less warding necessary, pushing champions more effective, AOE ulti's less effective, and ultimately leads to better decision making via the information given from the mini-map.
2. You have 34 standard camps and 2 lanes. In SR their are 3 lanes and 3 standard camps. Having so many camps makes it so that junglers will be the main focus and champions like mundo and shyvana with fast clear times will be considered OP and strong lane pushers under powered. This is okay because capture the flag is a side map and people will understand it not being perfectly balanced but we should still do our best to make as many champions viable as possible.
3. This map seems very large to me and if the map were to remain this size 6 players would not be enough in my opinion. However i wouldn't add more players I would have less of a map because even though I'm sure Riot servers can handle a lot it may be difficult for the actual players to run so much in one game. With that said, the pathing seems okay but could use a little work. Just make sure the path's aren't extremely long.
If you host a Google document we could maybe get a team together to tweak what you have, propose it to Riot, and get this Map onto the Riot Servers.