Hello. Grey beard here. Here are some thoughts.
First, I have been making sma connections for a long time. In the lab, I tend to tighten them finger tight unless I am making a phase measurement and then I use a plain old little open end wrench to slightly tighten. If I can't loosen it with my fingers, it is tight enough.
I don't think the obsession with breaking torque (Ha-ha, microwave parody waiting to happen) is insightful. If it is critical in practice, then stake the connection with epoxy (you don't need a lot).
The breaking torque is affected by surface finish and cleanliness. A connection made and broken many times will have less breaking torque for the same making torque. If I use a calibrated wrench I click it a few times (I hate break away wrenches).
It is wise to visually inspect both sides before making connections to look for dirt, damage, even metal particles on the Teflon surface (assuming there is teflon). The metal particles will lower the power handling of the connection and can degrade VSWR. (I worked on space products and we had to gage the connectors, everytime! Pins and dielectric and female holding force.)
If you see any thing, clean with a DRY q-tip and maybe GENTLE (dry) air clean.