Ok i get heat soak but do spacers really help?

Hey guys ive just recently heard the term soak or heat soak, i always thought the term was vapor lock but are they two different things? Also when its above 75-80 out and when engine is hot i notice it requires more gas (me pumping the pedal) after it sits for 5-10 minutes, dont really notice any changes while driving. Is this heat soak im experiencing? I have the fuel lines and hoses wraped with heat sleeve from about mid way all tge way to the carb, will a wood or phenolic spacer help any? Also does it matter how thick?