Could you slow down the rate of flow of the wort through the heat exchanger?

Great, thank you sir....

Sorry if this has been posted before but I couldn't find anything listed. I've noticed that on my Droid app I get different priming amounts than when I use my computer and go through the website. Example: Droid: 5gal, 2 CO2 at 68 = 3.1oz Corn Sugar, 2.9oz Table Sugar and 5.2 oz DME Web...