I like a guy who is enthusiastic. Just be patient. Although many may eat, drink, and sleep kart racing, most do have day jobs. Just a guess that 15 of those 16 were people just like you who are looking for 'go fast tips'.
The carb, engine, and chassis set up are all equally (more or less) important. If you are only figuring one of these (carb) is the secret to success, you'll be disappointed.
Not too sure how much change to the rules there will be for jr2 clone in addition to what is already being proposed for the bsp (stock) class. You may want to hold off doing any work on the engine till these are finalized. That's what I'm waiting for.
On the issue of 'go fast tips', beginning with the engine, are crankshaft end play, cam profile, stroke, piston-to-wall clearance, ring tension/end gap, bore size/roundness/straightness, rod-to-crank clearance, combustion chamber size/compression ratio, valve and seat set up, leakdown testing, spring tension/height, timing, coil gap.... ETC...
These are just a few of the things I look at, adjust, and correct... Does this kinda make the carb less important than you thought?
We are here to help... well, most of us anyway...
Mike