No, and I'm not 100% on this, but the engine will pull the air it needs, and 1.08 venturis are the best size. the 1.21 venturis work fine, and IIRC when air moves thru the 1.21 venturis its not at the same velosity as with the 1.08.
I'm not real sure on this either but, the velosity of the air moving thru the venturis pulls fuel from the idle circut in a siphon effect. At least this is how I understand it.
I think I would try changing your vaccume advance to straight manifold. instead of ported, see what happends.
On edit, Thanks Bagas. never heard of one of these. I must be one slow typist, took me at least 22 minutes to type this.
The difference in venturi size means you can ultimately move more air. But at lower air flow, like at partial throttle, the smaller venturi will move the air faster as it tries to get past the narrow part. This will draw the fuel out of the MAIN CIRCUIT better, more responsive feel because the metering of the fuel is better.
This is one of the main reason for going from a 1 to 2 to a 4 barrel. 4 small diameter venturis will ultimately allow more air to pass but at lower speeds it will do a better job of metering the mixture giving you better throttle response.
You can make a 1bbl flow as much as a 4 bbl but the throttle response would be sluggish.
Back to the original problem, what may be great jets for sustained RPM, doesn't always work for acceleration. You need a slightly richer mixture to accelerate properly.
The accelerator shot is great for WOT because the air flow is to slow for proper metering but as the speed starts to pick up you still need a little more fuel and this is helped by the POWER VALVE.
You need to see if this is even working, plugged or something else.
Don't forget you also may be pumping too much fuel with the accelerator pump flooding the engine in that RPM range.