Now I wonder if the discharge isn't too fast so that I will blast one end of the needle off rather than heating it up...
what are you going to do with this thing?
This is what I'm not sure about. How to effectively transfer the energy from the capacitor(s) into the needle. Some kind of special switch is going to be necessary. I'd like to see how you make out with this experiment.
have a timer set to automatically ignite them
I'd guess yes since the potential on cap-bank and charging circuit is equal..