For question 1, it sounds like you ferment in a corny keg... am i understanding you right? Or are you asking whether your serving keg should angle the dip tube to the center of the keg?
Regarding the second question, you might consider skipping the secondary (depending on the beer) and cold crashing before you package. I like cold crashing with some gelatin if i'm going to try and impress my friends with the brilliance of my brew
... but if i'm the only one drinking it i usually dont crash and just keg it after primary fermentation is complete.