Yak's a great plane, and it teaches you good habits. Get in there and mix it up. Get close, shoot and kill. Short ammo clip scares off a lot of pilots. But with some practise the Yak has no problem landing 2 - 3 kill sorties time after time.
BaldEagl, instead of the much despised La7, give its younger brother a try.
The La5fn has most of what is found in the La7, without the "dweeb" tag.
400 rounds of pretty good cannon ammo, good speed, acceleration, and fairly nimble. I feel like its actually more stable than the La7, and doesn't that nasty snap stall the la7 is prone to.
Plus I think a lot of people underestimate the la5.
Favorite kills for me in the La5 are :
Running down low & slow P51's.
Turning the tables on high P51, 109. Bait them till they attack, split S, zoom back up,repeat until you can equalize E states then get behind them. Then its chase them down to the deck till you can get them to quit flopping long enough for a good shot. Not easy, but a truly worthy challenge.
Get behind a spit 16 with a bit of E, and watch him spin, shake, twirl and flip trying to lose you. Most spit 16's if you stay a bit behind and above in lag pursuit will quickly flop their way down to the deck, blow all their E and give you a sweet shot at 2-300 yards.
Bomber formations, esp Lancaster's are 3 easy kills in one nice package.
On a good day you can take off, find a set of bombers, kill all 3 and land in 5 minutes. Rinse and repeat.