Hi Leonard,
There could be a number of causes for your carb to hesitate when the secondaries open up. My first instict would be to check to see how loose the secondary air valve is adjusted. Its adjustment is more critical on manual trans cars. (Automatics can mask a lot of troubles due to their slipping convertors.) If it feels too loose, try tightening it up with a quarter-turn on the spring-adjustment screw. Hopefully, the hesitation will go away. If not, my next suggestion would be to try richer secondary metering rods, or try a lower-lettered (closer to "A") hanger to raise the rods a little for a faster transition to the power mixture.
Let me know what you find out.
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