Scrapbox returning Error 503's. Please help

Hi, I've been using Scrapebox's addon Google Competition Finder. I purchased 10 semi-private proxies from Buyproxies but when I do any sort of run, the addon returns Error 503's back for half of my proxies rather quickly. I use 1 connection and a 20-second delay, and even this doesn't work for long. Seems like Google is banning not only the specific proxy but the entire subset (word?)--i.e., all the proxies starting with, say, 198.22. I open a support ticket with Buyproxies when this happens, and they give me new proxies but often they're already banned or get banned very quickly.

My question is: how do I run Google Competition Finder for hours on end without getting errors back fro my search queries? Another proxy provider? Public proxies? Thanks for any help!

The issue is indeed related to banning. And the more a proxy is banned the quicker it gets banned and the longer it stays banned when it gets banned. So wait 24-48 hours till they are all unbanned. Then go to the other extreme, try a 60 delay, does it work? If so start lowering the delay until you find the sweetspot of how fast you can go with you proxies.

The 503 is an internal server error on the proxies themselves.