holley 4160 help. 600cfm.

Hello, so i am trying to get my new carb dialed in, i have went from 65 primary jets to 67, I have also put the quick change cover for the secondary springs on. Holley says you should not have a "seat of the pants feeling" when the secondaries open, and by god thats what i have. I also am running the lightest spring for the secondaries, a 6.5 power valve. I know this carb. is undersize for my 360, but i am saving for a house so just trying to get the most out of it. I guess they say if you really feel the secondaries open its actually a power loss, and it should be a smooth transition all the way through, any thoughts?:angryfir::angryfir::angryfir::angryfir: