I have never gone more than a manual says. It's a fact in the machinist handbook : Bolt diameter x 1.5 is the maximum length of threads for strength, adding 10 more mm's does nothing. So, a 6mm only needs 9mm of thread length, or a 10mm, 15mm of thread length, the rest is useless...
Case in point, 16yo idiot, 1981 RM125, I snapped all 5 basket bolts. I was afraid they were not tight enough.
I should have better ones, but I have the 3/8ths and 1/2" drive Craftsman torque wrenches that seem to work well.....
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country