600 edelbrock secondary bog.

So I found out earlier this week that I only had 3/4 throttle with the pedal to the floor. I bought the bracket to fix that and now have wot. But now my 360 bogs when you floor it. Can't seem to figure it out. The motor is stock with edelbrock air gap intake and a skip white hei distributor. Runs great with the secondaries disconnected. What will get rid of that big at wot? I have tried the %8 richer secondary jets. That didn't seem to help though.