Jevity comes in different calories. Jevity 1.5 has worked great for me for two years. But I still dilute each can with either water, coffee or iced tea. The Peg tube should have somewhere on it how big it is. The measurements are in units called French (FR).
I started out with a 12 FR, then 14 FR and now have a 16 FR.
I didn't go bigger since I want to go to a button and every button has a 12 FR anti-reflux valve even if the tube is a large 24 FR (I think that's the usual size of a combo J and G tube.
The smaller the French size, the more likely it is to clog.
You sound like a great caregiver
Charm