The biggest advantage of using a dyno to tune is that you prove the parts you are going to race with. If you are not using the same carb that you dyno'ed with you know nothing about the mixture now and no doubt have possibly a huge fuel curve change by changing the bleeds after the dyno.
Get the bleeds back and carb set up you dyno'ed with and then look for where the problem is if you still have it then. Ignition and other things could be at fault if you know that the carb is working well which you can not be sure of now.
The demon carb is not the best choice for racing but if this is what you dyno'ed with successfully, then set it back where you were it and change step by step so you know what change the engine hates.
Bruce