As I already said in another post and board, it's really great to have you around Doc ;) ...  
  
When you said: 
  
 
  
You know there is a "trick" to simulate TRIM.  For those who flies in HARD mode maybe the Foxbat would be the first mod where you NEED to use the trim for more immersion ;) . .. 
In despite of that, It fully makes a sense to add Aerocoefficients on those big air intakes even if it's not very simple to estimate their values (a lot of trial and error would be needed ;) ).  So if you want to "autotrim" the bird, your solution is not "exgeratted".    
Nevertheless, I  think there is another way to take in account the air intake effect but without an hard calculation to estimate correctly the aerocoefficients values. In fact, you can consider the air intake area as a LEX for the wings. So you can you use (for a good approximation) the standard formulas to get the CLa of the "merged" wings.  I used this method in the Mirage Factory's F-15A FM.  Don't know which of both methods is the  best but I just choose the one who saved me times :D 
  
  
OTW, I have another questions about engines. 
  
1 - I'd like to know if  there are some infos in the manual confirming this 
  
ThrustAngles=-2.00,-2.50,0.00  
  
for each engines ? 
  
  
2-And How did you estimate the extra thurst generated by the RAMJet part of the engine ?