Interesting post! Most of the old timers I play with, jsut let the bow rest on the strings and don’t figure much on pressure. Personally, I WAS applying pressure when I began but as the months have gone by, I’m focusing more on other techniques like the rhythm in my arm (I”m also a lefty by the way!) and not slurring so much.
All that being said, I think just go with your gut and let the music tell you what it needs. If its a tad bit of pressure, do that for a while and see how it sits with you!