Sounds like you are boiling fuel.  What kind of spacer/insulator are you running?  If you have it right on the manifold you are probably getting too much heat into it with today's modern gas.  A phenolic spacer and/or a heat deflector may be required.  The amount of ethanol in your fuel may contribute - I had a car that did this primarily on winter fuel.  Fuel pressure is also critical to ensure that you are not blowing past the needle and seat.  Not sure what the new non-adjustable models need or can tolerate.  I had to go to off-highway needles and seats to calm mine down and that doesn't sound like an option with the new model.  Your air cleaner may also be an issue if it traps hot air around the carb.  This all assumes that you don't have a faulty needle and seat.  If you got some dirt or teflon tape in there, it may not seal and it will pump fuel.

i'm running the stock pump & carb has been fine with that for a couple years. just started this in the last few weeks. fuel lines are all new from tank to carb & filter is clean.

pulled the rear bowl & metering plate today. didnt see anything out of the norm in there. pulled the float, no pinholes or gas inside. pulled the needle out & cleaned it along with the fuel passages.

couldnt put it back together & test drive today. the  blue "non stick" gasket didnt do as advertised. it stuck & tore all to hell. have a new one coming in the morning....