My Keezer has been running great with 3 normal CO2 driven kegs. Last night I kegged a Guinness style Irish Stout and it is currently charging with CO2 I expect for a couple days or a week? I have already installed a Nitro faucet and I have my Nitro cylinder and regulator ready to go. My question is…. How do I determine the length of the beer side hosing? And at what PSI do I run the Nitro blend (75/25)?