I didn’t see if you mentioned exactly which 950 the dyno shop has, but there are at least 3 different sizes of “950’s”, one of which is actually slightly bigger than the QFT Q-1050.
The Holley XP950 is 1.600v x 1.750.

I had a customer that I prepped some heads for and sold him a cam, who had bought one of those.
It had some major issues on the dyno. They made a bunch of changes and pulls with it....... but it had some manufacturing defects that weren’t going to be tuned out.

I was kinda surprised the dyno operator didn’t tell him it wasn’t going to be able to be fixed with tuning changes.

I’ve run into that scenario a few times, where there are problems with the carb that air bleeds and jets won’t solve.