Keeping the PV closed will help with off idle power.. If it opens too soon you'll have a more aggressive delivery, which is not necessarily 'more'..
What gearing do you have now?
What jetting do you have?
My experience with these engines is..
13-50/51 gearing
head modification (squish and comp ratio)
quick pull G2 throttle
jetted with Keihin needle for response and delivery (has varied on each engine).
I have used Lectrons and Smart Carbs.. I don't think they offer value for money. They work well enough, but aren't a magic product either. Still require some adjustment and still aren't 'perfect' persay.
The above list I do before I worry about anything else.
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