Hydratech Hydraboost RPM Drop?

[Hydratech®]

No doubt in my mind that it's the cam giving you troubles at idle / low RPM. With such a rowdy cam, a much looser torque converter (higher stall speed) would help ease up your idle issues. In your current state of tune, I don't know how in the world it's going to handle the load and extra heat when the A/C comes on - may have to install an idle kicker solenoid to keep it running to offset the load of the A/C. Have you done any carb and ignition tuning to help generally strengthen up the idle characteristics? There was a discussion on Chevelles.com about a similar topic that I ran across recently, though cannot seem to find it now. Take a look over there and see if the tuning gurus can give you some pointers. It sounds like the hydraulic brake assist system is working properly, though your state of tune is creating idle issues that are the bulk of this discussion.