The Excel always came up clean, and the Hybrid MKI did better than the scoops most of the time ...
... But not always (The Mantus was cleaned off--they were about the same). The crown is lower than the Excel (120 degrees vs. 90 degrees), which may increase fouling. The edge flange is wider, which improves setting and penetration of layered soils, but increases fouling. I'm thinking the next trial may be closer to the Excel crown angle (maybe 100 degrees) and an intermediate flange width. Both have a similar toe downturn.
The Knox set and held well, but it always came up clogged. The wings are as bad as a roll bar, and it seems that the high shank merely creates more space for mud and trash to accumulate. The split toe certainly does not improve release.
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