Jen,
My daughter Samantha also gets enzymes through the tube. Our nutritionist told us that this only works with Pancreacarb 4 enzymes. We switched from Creon 5's to Pancreacarb. The Pancreacarb "beads" are smaller. We mix 6 capsules with about 15-20 cc of applesauce (baby food). Then we transfer to a 20cc flat tip syringe that fits directly into the MicKey button. Usually we don't have a problem. She also gets 3 more capsules at the end of the feed.
If it does get stuck, we insert a 3 cc syringe of water to loosen it up, wait a few minutes, and then try again.
Prior to the Pancreacarb, we also tried Viokase powder. This powder form enzyme is mixed with water and then put in a syringe to be injected into the extension tube. Unfortunately, Samantha seemed to malabsorb a lot with the Viokase, but you might have different results. It is more expensive than capsule enzymes.
You might want to ask about putting the enzymes directly into the bag. Our clinic has never informed us about that method. They did mistakenly tell us to put the Viokase powder directly into the bag - which resulted in Samantha going to the hospital with a near blockage!
Maria (mom to Sami 2 1/2 with CF)