It depends on many factors. DNS servers, locations, time of the day, etc. that would affect the quality of proxies. Other days, proxies are great...other days..not so great. That is pretty typical.
SickSummitter is different. We have not tested proxies with SickSumitter, as every application is different.
Please PM with your email address - I'll check your account - then I can help from there.
Digging old threadsNew here can you send me you contact don't know how this works yet.
Digging old threads