User blog comment:Kitahara/Recording drum expedition success rates/@comment-25730832-20150405133137/@comment-25283969-20150411153735

during my runs with 14 drums and 3 sparkled ive got a GS chance of

86.24% for exp 21 ,

86.22% for exp 37 and

86% for exp 38 (with 15 drums)

exp 38 had 1/4 of the samplesize the others had,so out of these values you cant say that 1 additional drum decreased the chance to get GS

otherwise it seems that exp 21; 37 and 38 have the same chance with the same conditions

source:https://docs.google.com/spreadsheets/d/1gaogWotIcToI_3ULPdOzWTZNsik9IVMSpQVeFMUyrKQ/edit#gid=0