The biggest problem with the Lil' Satan is it is just too small. The key to a good flying combat plane is wing loading. Most of the modern fast combat models are around 500 square inches. My modern 1\2 A foamy is 260 sq. in. That is huge compared to a Lil' Satan. Knowing how to get more power from the engines helps with the speed but wing area allows the design to turn without stalling.
The first time I saw a modern combat design fly (1990), I was absolutely amazed. I could not believe how fast it was, and at the same time how quickly it could turn. After talking to the pilot, who had asked me to launch for him, he taught me a great deal about design. The other surprise was the thick airfoil. The speed came from sheer power, and the turning came from weight, wing area and airfoil.
I think from a design standpoint, combat models are magical. I am very much looking forward to getting my first Russian 1\2 A.