Here are all of the non-perk fighters ranked first by kills in Tour 21 and then by their ENY values. I have highlighted the top ten in each category.
I recognize that some aircraft cannot have an ENY value that reflects the actual use of the aircraft, for example, the P-51B looks like it should have an ENY of 45 by is usage, but its performance would mean that this setting would be giving nearly free perk points to those who fly it.
The P-47D-11 and Ki-61 on the other hand seem to have ENY values that are much too low when compared with their usage and performance.
I think it is clear that HTC needs to adjust the ENY values of some aircraft.
The Spitfire Mk IX has 19833 kills and has been killed 17813 times.
The P-51D has 14036 kills and has been killed 13370 times.
The N1K2 has 12717 kills and has been killed 12116 times.
The La-7 has 11694 kills and has been killed 10310 times.
The SpitV has 8196 kills and has been killed 8945 times.
The Bf 109G-10 has 7739 kills and has been killed 6043 times.
The F6F-5 has 7224 kills and has been killed 7309 times.
The Typhoon IB has 6784 kills and has been killed 5007 times.
The Mosquito Mk VI has 6475 kills and has been killed 9012 times.
The A6M5b has 6121 kills and has been killed 6840 times.
The Hurricane IIC has 5655 kills and has been killed 4669 times.
The Fw 190D-9 has 5648 kills and has been killed 3652 times.
The F4U-1D has 5268 kills and has been killed 6731 times.
The P-38L has 3905 kills and has been killed 5365 times.
The Yak-9U has 3604 kills and has been killed 2743 times.
The Fw 190A-5 has 3508 kills and has been killed 2111 times.
The C.205 has 3407 kills and has been killed 3005 times.
The SeaFire has 2376 kills and has been killed 3161 times.
The Bf 109F-4 has 2361 kills and has been killed 2266 times.
The F4U-1 has 2346 kills and has been killed 2296 times.
The Fw 190A-8 has 2311 kills and has been killed 1963 times.
The Bf 109G-6 has 2266 kills and has been killed 2005 times.
The P-47-D30 has 2235 kills and has been killed 3100 times.
The Ki-61 has 1530 kills and has been killed 1364 times.
The La-5FN has 1427 kills and has been killed 1247 times.
The Bf 109G-2 has 1396 kills and has been killed 1293 times.
The P-47-D25 has 1317 kills and has been killed 1413 times.
The Yak-9T has 1189 kills and has been killed 1337 times.
The P-47D-11 has 937 kills and has been killed 1007 times.
The P-51B has 870 kills and has been killed 978 times.
The C.202 has 689 kills and has been killed 1205 times.
The Hurricane IID has 639 kills and has been killed 1469 times.
The Fw 190F-8 has 602 kills and has been killed 804 times.
N1K2-J ENY 10
Spitfire Mk IX ENY 13
La-7 ENY 15
F4U-1D ENY 18
Fw190D-9 ENY 18
Ki-61 ENY 18
P-47D-11 ENY 18
P-51D ENY 18
Bf109G-10 ENY 22
F6F-5 ENY 22
A6M5b ENY 25
F4U-1 ENY 25 (New aircraft)
Fw190A-8 ENY 25
Fw190F-8 ENY 25
Hurricane IIC ENY 25 (New aircraft)
Hurricane IID ENY 25 (New aircraft)
Mosquito Mk VI ENY 25 (New aircraft)
P-51B ENY 25
Seafire ENY 25
Typhoon IB ENY 25
Yak-9U ENY 25
P-47D-30 ENY 29
Fw190A-5 ENY 30
La-5FN ENY 30
P-38L ENY 30
SpitV ENY 30
Yak-9T ENY 30
P-47D-25 ENY 31
Bf109G-6 ENY 35
Bf109F-4 ENY 40
Bf109G-2 ENY 40
C.205 ENY 40
C.202 ENY 50