Joseph, the 3 you mentioned with lower germ (Alabama Red, Fife Creek Cowhorn, Star of David) are all heirlooms that have longer/staggered germination. Faster and more uniform germination seems to be a trait modern agriculture has bred for more recently.
The longer/staggered germ isn't an issue here in the South -- with hot days and warm nights, the slower germing seeds catch up fast -- but makes a big difference to you northern folks!!
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