Congratulations on your win and welcome to the forum!
The rudder control is adjustable for tension and position -- sounds like it may be adjusted improperly It should be sitting about at a 45 degree left (if left mounted) to allow equal swing in both directions. Some on the forum have remounted it at a different position as well.
Use the search feature to see more or go to the FAQ section or consult your owners manual (also available in line). There is lots of info on this issue.
It's hard to beat the Native seat for comfort. Maybe you can adapt one for the PA.
Personally, I add an i-comfort seat pad to the bottom and a 2" square boat cushion to the back for better pedaling comfort and power, but most seem to like it well enough the way it is.