Specialized Pathfinder 700x38 vs Continental GP5000 700x32 (and similar)
??!
the difference in long road rides should be very noticeable and significant
the tires will weigh less - especially with a smaller tube included - and should have less rolling resistance
and many more tires should make a difference ... including the Continental GP4S ... Panaracer Gravelking slicks ... etc etc etc
install those tires and you will wonder why you didn't make the switch sooner