Can't help with torque values I wish they were given on the packaging. I just tighten and make sure it's held firmly. The biggest danger IMO is being armstrong and snapping screws. If I remember correctly the screws are either long "through screws" that prevent the mount from moving out of the chosen slot position, or the riser has male parts built in to prevent movement. But either one, when tightening move the mount to the forward most position in the slot. In normal operation the mount and sight wants to move forward under recoil. So go with the flow, put it there from the start and it won't move.
To fine tune dot height they make all sorts of lesser height risers. My "stuff" boxes have a mess of these and I piggyback them to fine tune height, then buy one to get rid of the piggybacked risers. My rifles commonly have one high mount such as you bought and a lower mount piggy backed to give me what I want. I just don't want a mess of risers elevating the sight. One or 2 risers is acceptable to me. If you can't live with that you might find a riser built for the correct height but be sitting down when you see the price. What I did for $20 I found a one piece riser could be done for $100.
Below is an extreme example of piggybacked risers. It's on a handgun that gets cheeked, it's also the installation that saved me $80 over a 1 piece riser. You'll recognize the riser.