Google competition finder addon usage

Hi,

I'm using Google Competition Finder addon to analyze the competition for keywords.

I'm using 15 private proxies I purchased for that matter.

I'm running the competition finder with around 50 keywords (all with a google search operator) at a time.

For the first set of 50 keywords I can get the results for several keywords.

But after running this a few times I start getting error for most of them to the point I get error for all of them.

Then I need to wait a lot of time until I can start using those proxies again to run that search.

But that will take a lot of time to run through the big list of keywords that I have.

What is the best way to do this without getting errors?

The only solution is to buy more proxies or keep waiting until I can run the search again?

Thanks