Wow with a compliment like that I guess I should try and say something intelligent.
EDIT: I just noticed where Gepard told you essentially the same thing I am about to, only with less long-winded explanation. So this is just an expansion on what he said.
If you want to tweak on the aircraft's max speed and acceleration without getting too involved in the coefficients (most of which are beyond me anyway, you need Streakeagle for an education on that) you can look at the following section, starting with the Fuselage component:
CD0MachTableNumData=5
CD0MachTableDeltaX=0.40
CD0MachTableStartX=0.00
CD0MachTableData=1.195,1.000,1.008,1.792,1.767
Basically, this is a table of data that modifies the CD0 value (CD0 being drag coefficient at 0 alpha).
The first line defines the number of data points in the table.
The second line defines the "distance" in Mach between each data point.
The third line tells the game that the table starts at Mach 0.
The fourth line contains the data.
So, let's say that the CD0 for the fuselage was 0.01 (just for example, to make this easy, that is actually a fairly high value for CD0).
At Mach 0.00, the CD0 would be 0.01 x 1.195 = 0.01195
At Mach 0.40, the CD0 would be 0.01 x 1.000 = 0.01000
At Mach 0.80, the CD0 would be 0.01 x 1.008 = 0.01008
At Mach 1.20, the CD0 would be 0.01 x 1.792 = 0.01792
At Mach 1.20, the CD0 would be 0.01 x 1.767 = 0.01767
So, you can see how between Mach 0.80 and 1.20, this airplane runs into a "brick wall" of drag, with the CD0 increasing over 70%. Its a safe bet that this airplane would normally be subsonic, and might break Mach 1 in a dive.
What you can do is change the values in the table, and even add more data points to get finer control over the drag at various speeds.
For example, if you wanted this aircraft to have better acceleration between Mach 0.4 and 0.8, you could reduce the third value in the table.
Likewise, if you wanted to extend the top speed to Mach 1.2, you could reduce the fourth value in the table.
Make changes in small (5 or 10%) increments and then test.
Several of the components that make up the plane will have CD0 tables like this, but if you just want to make a quick and dirty modification, you can play only with the table for the fuselage. Also, there are other ways to accomplish the task, such as playing with the engine altitude tables, but this will give you decent results and as mentioned is quick and easy.