Also, as a side note, is it generally accepted that lighter people should run softer bushings? I'm 5'9" and weigh about 140 at my max
A lighter body will find it much harder to put weight into turning trucks than a heavier body, who might often put too much turn (and wheelbite) on the same duro bushings, most being about 90A duro in the stock bushings, but can go down as far as Indy super soft 78 or up as high as 99 or even 100 super hard kegs.
I know some super big dudes who ride the softest bushings and like it that way, but that is the exception as most bigger guys ride harder bushings and smaller dudes ride softer bushings or struggle to turn on stock bushings.
I have helped a lot of younger and lighter bodies with both these options equally, but if you cannot turn with normal bushings, you can either cut the tops down on the ones you currently have, or just buy softer bushings to replace what you currently have.
Lots of choices, maybe too many.