That bog could also be from the accelerator pump-squirters also, you don't say if you've worked with those? I've also found that if you run the fuel level right at Edelbrock recommended settings and you haven't checked the pump height your pump can be a little above your fuel bowl level. If you watch the squirt from idle and you snap throttle a little and the squirt is delayed just a smidgen that can cause a bog also and will go away if you raise fuel bowl level just a tad.