Without having the book at hand as I recall those bolts should be torqued to 40-60 ft.lbs.
I set mine at 50 ft. lbs. and can move them with a hefty pull. The friction on the L-bracket is what gives the sway control more than the hitch head bar connection. Loosen the bolt torque to where you want it. Remember to grease those rub points on the hitch head every time too.
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