I weaned Callum because my supply was crap so I had been topping him up at all feeds. Essentially the way we stopped BF altogether though was to give more formula at each feed and then no (.) at all IYKWIM? For those last two feeds (mine were first thing in the morning and then mid morning) I just dropped one and about 5 days later dropped the other. The first one I think I needed to express once and then the next one didn't need to express at all and didn't feel uncomfortable either.
Great that you're feeling more rested, it's amazing how much BF takes out of you huh. I still have sad moments sometimes about not BF but Callum is happy (and chubby) and therefore so I am