As far as the "Wack System Modification Jan 12th Cut-off" post, the following has been updated:

We are currently using the math we have been using for a few months.  You are free to explore the wack math to figure it out.  I will be unable to walk you through the math.  Your existing knowledge of how wack works based may be incorrect.  Really old easy to come back kills may not be included in your current math if you have stopped building.  Hard to come by kills will be included in your current math if you have stopped building.

I am unable to answer any further questions on math, the wack code is as it was for the past few months and is balanced to connect the top to the bottom to the effort put in.  The defense is tied to the best offense.  The offense is tied to the best defense.  The BG math is tied to the current status of the game.  

You can build a cap killing gun, you can not maintain a cap killing gun forever if you stop putting in effort unless it is all previously obtained the hardway. (since they do not fall off)