rinoldi, another thing you can try , remove the needle from the carby, connect your fuel pump to the carby direct, place one finger over the hole where the needle goes , pump fuel into the spraybar for half a second, then reverse the pump and suck out the spraybar. If you have a foreign body in the spraybar then this should shift it, because it sounds like you have something in the spraybar that is not allowing a full fuel flow at full throttle. Hope this helps
Bill.