Optimizing Americommerce Connection

Good Morning, 

I need help optimizing my Americommerce API connection. I'm allowed 100 calls/per 10sec. I set the concurrency down to 9 and disabled Auto-recover rate limit errors and at the end of the run I get around 500 errors due to the rate limit being exceeded of course so I just retry them and I'm able to update all the records quickly. When I enable Auto-recover rate limit errors it takes considerably longer to finish updating all the records. What would be the best approach to take advantage of the 100 calls/per 10sec and also auto recover rate limit errors. 

Thanks