I can relate to the big guy reality but I can speak to tire upgrades. My Quick 1 came with Schwalbe Spicer K-Guard 700x30 and around 2,200 miles I swapped them for Schwalbe Marathon GT Tour 700x35. I love the more forgiving ride with lower pressures as I do ride surface streets. They are heavier but I’ll take the durability and comfort at a slight weight and speed penalty.

Was considering 700x38s but was concerned about clearance and the 700x35s were the safe upgrade. Also, the GT Tour was discontinued after I purchased them.