Any carbon steerer or bars that are well made should not be in risk of damage with 7Nm of torque. I've done some tests with cutoffs from LOOK steerers, tightening a stem with two M6 bolts as tight as I could with a long handled hex wrench and it caused no damage at all. I don't know the specific torque applied, but it had to be 2-3 times the recommended amount.

I've been wrenching for 25 years and owned plenty of CF fork, bars and posts. I use a 4-5-6mm Y-style wrench with a moderate twist of the wrist and never once used a torque wrench on the clamp bolts for any of these parts. Under-tightening can result in the bars slipping and damage from twisting the bars.

My favorite stem for firm holding with moderate torque on the clamp bolts is the Ritchey 4-axis 31.8mm. That''s the only stem I use on all of my bikes.

If you manage to break a CF part with 7Nm, the fit between the two parts was poor and/or the CF part was a piece of crap to start with.