Not sure about your particular
device but had similar issues with some rigs I started way back in 2015.
If button activated try releasing then re-pressing the fire button when you know you're getting close to the cutoff point. This always worked with whatever
device I had the problem with and was really not that much of an interruption.
If draw activated you may be able to accomplish the same result by interrupting your draw for just a split second then continuing on?
Neither option is ideal but probably the only way to extent your draw. Shouldn't take much to get use to the split second interruptions. If it's button fired you don't even really notice that much.