I don't think 2300+ is possible purely depending on skills. In my opinion a 1900 can beat a 2300 just by getting lucky on picks. So you need luck (or lack of unluck) to hit that sweet number. That being said, part of the problem with 2300 is the ladder system itself. When I did my run a little while ago, my picking was focused on reducing the possibility if "unluck" rather then what was the best picks. For example I tried to avoid having two territories bordering after picks.
Likely you will have a bunch of 19 and 18 hundreds opponents. What you need is to play against as many of 2k + as possible. At that rating the level of risk/reward is more in your favor. (Wins gives more, loss hurts less)
In order to get 2300+ i think you need a record of something like 27-3. (assuming same as Buns opponents) I don't think that is possible, without having luck on your side. The way I read it you have already reached top 5 on another account. So the skill is not really the issue. If you just count the games out/use custom scenario then you are already good enough to reach 2300+. (Along with many others as well. However being good enough =/= being able too :P )
DISCLAIMER: Some of the information below deals with gaming the system/cheating. If you decide to use it the wrong way, keep in mind that actual penalties exist (and have been enforced) for cheating on ladders. I strongly advise that you don't use the information below to cheat on ladders and instead use it as a toolkit to recognize when your opponents may be cheating and report them.
Recognizing when your opponent is exploiting the ladder
Pulsey's guide: https://www.warlight.net/Forum/44437-guide-ladder1-stall-boot-choose-opponent-etc
Qi's guide: https://www.warlight.net/Forum/28007-manipulate-ladder-system
Don't read them to cheat/stall, but to understand that some things is good for getting a high rating. It is not really deepening on skills.
(you are ofc welcome to prove me wrong, and get 2300+ while having more then 50 unexpired games.
Edited 8/1/2016 21:41:21