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There is no reason to torque those fasteners. Just snug, with some blue locktite, is all that is needed. I also think torquing the drain plugs is risky business. I've noticed a lot of people on this forum wind up with stripped drain plugs from a torque wrench.
I would not recomend using loctite on derby cover screws. Use a little never seize and torque them per manual.
Get rid of those damn Torx bolts and get allen head they work much better and don't strip.
+1 Go to Orchard Supply Hardware. They sell really nice Chrome Allen Head bolts that look exactly like the original Torx (27) bolts except that they have three advantages: 1.) They're Chrome, 2.) They're Allen Head and 3.) They're not cheap $h!t pot metal like the OEM bolts.
Harley uses Torx Plus size bolts that are just a hair bigger than Torx regular. The Torx Plus bits are more expensive as well. On ebay, they are always more expensive.