User blog comment:Kitahara/Recording drum expedition success rates/@comment-25730832-20150405133137/@comment-25832576-20150411114249

Heyo man, I am currently running 21 and 37 with full drums and 3 sparkles (preparing for the worst after that warning), and currently the rates are 84.62% and 83.33% respectively. Thats pretty close, and could give credibility to your thought of a drum cap.

But assuming sparkles give 16% per ship, that would mean the base rate with 15+ drums is 35~36%. Whether it means theres an overload penalty (hoping not ~.~), or you've been getting lucky, or I've been getting unlucky, is still yet to be determined.

Happy Songkran, and thanks for your efforts so far!