What is disappointing is the belief that one can develop the 'perfect' static trade system.
Utterly impossible! Any Developer who thinks he/she can develop such a system with enough tweaking and adjustment is going to fiddling be with it forever.
And you have been fiddling with it since this server started.
And you will keep fiddling with it until this server closes.
Why? because economics is inherently dynamic, and subject to human nature, a fundamental principle of economics.
Human nature exhorts us to get the best possible price.
It is why people use FLCompanion.
It is why a veneer of RP (and sometimes not even that) follows around the BEST POSSIBLE place to make money.
Always.
Every time.
Every, single, time.
You want a solution to this problem? You want to stop having to chase up all these little fixes and tweaks and nerfs?
How about making the PLAYERS do the chasing?
How about rotating a percentage bonus across a certain number of prime RP routes? Make the powertraders and miners follow that around. There will still be an amount of clustering - but it will be rotated around the server so everyone gets a piece of the pie.