You can jam, but with a bigger stack, you can also use the min-raise to your advantage really effectively. You can also min-raise with intentions of calling shorter stacks and folding to larger ones to avoid big all in confrontations when you have a nice stack.
Getting good at ranges for me is just working with ICM calcs, and looking for very common situations and looking for the differing variables and how it affects your
equity in the tournament. It's mostly common sense when you think about it and try to not worry about getting everything perfect because it all relies on accurate ranges given to opponants which we never really know. The best way imo is to develop a training plan, and work on 1 thing everyday before you start playing, This helps you retain the information on a daily basis, rather than overwhelming yourself with info/ranges and you forgetting half of them.
mass volume again depends on your personal situation. But the best grinders are 15-30 tabling and are playing 100's of tournaments a day. For me, my goal was to always play my max table count, this depends on a lot of differing things, but mainly it depends on how much you need to think about decisions in game, and how much you are automating decisions. This does not mean you are not adjusting to opponants, but you should be making things as simple as possible in game, as you have 2-10 seconds per decision. The other things that help you gain speed are table setups/ hotkeys/ having a decent computer/ internet speed etc. But the main reason i want to play my maximum table count is that you can play less total hours in a day while still putting in plenty of volume, this will all really just help with you making $/hour instead of focusing on ROI's. If you can, while you run down 180 mans it's always a good idea to load some other games to keep your table count up, i generally loaded up a few hyper turbo sngs while my main games closed down, just so i wasn't wasting too much time.
Yes my max in hyper turbos for example is 12, as soon as i go past that my ROI drops off rapidly. But there's always room to add more, you just need to get quicker/better at making decisions, a lot of this comes from experience, but you can try some of the things mentioned above to help you speed up the process a bit, like everything else, the more you put into the game the more you get out of it.