Though I have no knowledge of the Skyranger, I have some on C150/152. You can look back into the history of the 150M, which has the same tail as the 152. The 150M has a rudder and balance which is 6 higher than the previous models of the 150. This was said to have been done to improve the effectiveness for the rudder. It is worthy of note that when Cessna extended the rudder on the "M", they increased the area of the aerodynamic balance as well, rather than just moving the same balance higher. I'm sure that if you enquire of an operator of a mixed fleet of 150's there will be more insight and observation. Genghis might have some thoughts on this.
Good luck on your dissertation...