That's why you farm them. I don't think your numbers are incorrect over the long run. I get speed secondaries more on the order of 15% and 5% for the coveted "primary" secondary. By now at least 1 in 5 of my toons has the primary speed secondary. Took a while but this game is a grind, you don't win every battle, get every mod or get a player to G12 every week. Just keep playing and you'll get there.
I farm mods like crazy and it's taken ages to collect the 30-40 +30 Speed arrows that I have now. And my highest secondary is only +16. Can win the arrow war but not the secondary war. Them's the breaks!
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Unfortunately, the only one with speed didn’t increase