Suggestion if not too late - Secondary Opening check?

Maybe you did this already but many times with a Vac Sec carb (Holley 390 or 600), folks will force the secondary open mechanically for the dyno so it doesn't flutter or get lazy about opening.

Or at least if you can film or watch to make sure the secondary is opening all the way.

(A 200hp engine should be able to pull a 390 Holley completely open, and a 300hp engine should be able to pull a 600 Holley all open)

Reason I mention it is, believe it or not, the 3 horsepower hints so far are running about 5% BELOW what my Gonkulator computer predicted, whereas torque was right on. Not that the computer is always (or ever) totally right, I was just looking for things besides timing and jets that might be holding it back a bit like mufflers or a partially open secondary.

Then again all this dyno data will give my Gonkulator a slight attitude adjustment I am sure, so, just suggesting here just in case.