Love the La5, & have flown it almost exclusively for 2 tours now.
Yak seems to pull away from it eventually on the deck.
If diveing into a turnfight with lots of E I can ussually manage 2 to 3 circles before I start loseing ground. Soon as you stop gaining position on the con it's time to extend out.
Keep it fast!
Excellent dive handleing, esp if you use the autoangle to keep it trimmed.
Cannons to my mind are no worse than anything else out there except the HS. Turbo lazers they arn't, but I have no problem getting 3 to 5 kill sorties (on a good day anyway)
Get close, short bursts on target & down they go.
Planes to watch in the LA5 (IMO)
Niki, (wicked E retention, watch their initial zoom) and fast reverses, not to mention they turn better. However,if you can spiral climb them till they stall they are easy meat.
Yak, if co alt/E tend to be very long brutal fights.
C-hawgs, esp if they have altitude.
Watch their zoom, watch for their reverse. I find a combination of horz & vert seperation keeps me out of their guns the best.
If you can get saddled up, plan a slightly lag pursuit, and be patient. Sit back there on their 6, hoard your E. It may take a while but eventually they'll run out of steam and either run (yes you CAN catch them) or they'll get low & slow & try to turn. Move in & teach them fear at this point!

Anytime you'd like to wing up with RW arty just yell. 2 La5's is 4 times the fun!