26/08/2023
When your setup is too fast, you might be having misfeed. Apparently, in my case I used 13:1 gear ratio using my stock tappet plate. With the stock tappet, it contacts with my delayer for quite some time and then during full auto, it cant make full release before the delayer hits again the tappet plate causing me dry firing, misfeed or double bbs. The solution is either to cut the tappet or replace it with shorter delayer contact.
I chose to buy another tappet plate with short contact so it will release the tappet-nozzle earlier than before.
Blue-stock tappet plate
white-JG tappet plate
problem solved, no more misfeed.
It can also be solved by lower current setups by changing batteries but will run slower which defeats the purpose of optimum response.