Is it normal that I’m able to drink 16 oz of water in a matter of minutes (with some discomfort but not much). Worries I’m doing something wrong ? or that they didn’t cut out enough of my stomach!!!

Totally normal. By the end of the first week I could drink 8 oz in a few minutes with no discomfort and 16 oz in 10 minutes with no discomfort. You will feel discomfort with solid food if you have a few small bites in a few minutes and get a tightness or feeling "stuck" in your chest unless you go REALLY slow (I am just learning this).

The liquids just go right through your stomach, so this has nothing to do with the size of your stomach.