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If it snaps at 6.8, it'll snap at 8Nm.
No slippage at 6.8, constant adjusting though as I lend out my bike quite often. Check up on the reviews on MTB forums.
No such issues neither with Salsa nor Thomson which have the barrel nut and steel bolts.
Only suggested the former as OP wanted clamps which comes in both QR and Allen key, otherwise I'll go Thomson with the 4mm instead of the 3 they are currently supplied with.
I do, 5Nm and 6.8Nm, I guess you don't?
It's their design and choice of material, both flawed...
^ what he said...