Blind Shakers Give Higher Extraction... Right?

An espresso extraction test on a blind shaker vs WDT. I don't find any difference in extraction, but the shaker did have more variable flow rates and was just a hassle to use.

Data:

Obs,Type,Dose,Time,Output Mass,Flow,TDS,Yield,Issue,Notes
1,WDT,18,27.8,40.6,1.5,10.41,23.48,0,
2,Shaker,18,28.2,40.9,1.5,9.97,22.65,0,
3,WDT,18,24.4,41.6,1.7,9.80,22.65,0,
4,Shaker,18,25.6,41.3,1.6,10.11,23.20,1,Memory Time
5,WDT,18,25.4,41.3,1.6,10.13,23.24,0,
6,Shaker,18,24.8,41.2,1.7,9.96,22.80,0,Squirt
7,WDT,18,25.8,41.1,1.6,10.16,23.20,0,
8,Shaker,18,24.7,43.0,1.7,10.07,24.06,1,"Squirt, reverse weight"
9,WDT,18,25.2,41.7,1.7,9.69,22.45,0,Water Refill
10,Shaker,18,23.2,41.3,1.8,10.09,23.15,0,Squirt
11,WDT,18,22.3,41.1,1.8,9.86,22.51,1,Memory Weight
12,Shaker,18,22.5,40.5,1.8,10.28,23.13,0,
13,WDT,18,24.5,41.5,1.7,10.40,23.98,0,New bag
14,Shaker,18,21.3,40.9,1.9,9.81,22.29,0,
15,WDT,18,23.1,41.8,1.8,9.83,22.83,0,
16,Shaker,18,21.4,41.8,2.0,9.73,22.60,0,Squirt
17,WDT,18,22.6,41.4,1.8,9.87,22.70,0,
18,Shaker,18,21.7,41.6,1.9,9.75,22.53,0,
19,WDT,18,22.2,41.0,1.8,10.00,22.78,0,
20,Shaker,18,20.3,42.2,2.1,9.58,22.46,0,


=== Timestamps ===
00:00 Introduction
02:58 Caveats
05:43 Testing Methods
10:40 Results
15:52 Conclusions