You're not going to earn any perks flying the low ENY planes.
Besides the p47, a few higher ENY planes worth trying,
F6F(Good E fighter, can take damage, turns well at speed)
F4U-1(Fast. Excellent turning ability at speed)
La5(Quick accel, fairly fast, good turn ability. Bad guns though you need to get close)
Hurri IIC(Excellent turning ability and guns, little ammo and low speed though)
FM2(An amazing turner, kind of slow but can dive extremly well. Armed with four .50's and lots of ammo.)