HiTech;
Well, since you asked for opinions, I'll throw in my two cents worth...
I remember studies on computer and program response times, conducted some sixteen years ago. Peoples attention span lasted about as long as it took to reach for, and sip, a cup of coffee. If the program took longer than that to respond, they lost their train of thought, and they lost interest in the program. In light of those studies, I would think long and hard about having people click on fly, and then wait in the tower while they brew a pot of coffee.
Perk points have worked well in limiting the use of very high performance planes in the MA. As you have pointed out, they do not work well in balancing the numbers in the MA. I believe the reason is, perk points offer a carrot, without the subsequent stick for ignoring the carrot.
Start perking the 44/45 plane set when numbers reach a certain threshold. If the imbalance continues to grow, start perking the 42/43 plane set. Human nature being what it is, we will take the carrot if the alternative is always the stick.