I don't know what's causing the big bubbles. Try setting your regulator to 17 psi if it's not already. You can fill your bubble counter with a syringe. The one I have in mind does not have a hypodermic needle. But still be careful with it. I take the needle off the end of the syringe when it's not in use. Here's the link:
Our ink syringe set allows you to reuse and refill old ink cartridges with your choice of ink, get the last drop of ink out of the bottle, or transfer ink from one container to another. Includes two 5ml syringes and two 20ga needles.