OK my 2 cents worth on this,I am just under 300# and just bought the same bike, at first before the ride I noticed a slight rotor rub, I re-aligned the caliper. once I went for I ride I could not believe how easy it rolled compared to my older Cannondale Synapse with 28 Gaterskins. The only thing I went tubeless and run about 50 to 60 psi
Check the wheels and make sure they rotate freely. Those tires should not slow you down where it would be noticeable, unless way under pressure (10 to 30 psi).