Days behind here, but you need to invest in some mining hardware yourself and setup your own test environment and not use the real world for testing? Unless you already do that? If there was 0 fee then I can see you not worrying about it at all, but since this is one of the few pools that charges a fee it should be a premium service? Please don't take this as arrogance, it is hard for me to word my paragraphs sometimes.
I have mining hardware. I did test it myself. For days on end, purposely trying to break it. It did not break. There is no feasible way to test something designed to handle tens of thousands of connections with varying hardware and varying speeds, on a local test.
The project was completely scrapped because I do not want to repeat live testing, and there is no alternative to live testing to test this kind of software. I cannot just go up and buy 4000 TH/s and place it all over the country so it connects from 30,000 different locations in every country on the planet.
Even the largest tech companies eventually have to push out updates to their online services, and they break. There is simply nothing that can compare to regular users connecting in massive numbers. Unit testing and local stress testing simply cannot mimic the organic loads and broken client implementations that exist in the real world.