For the OP...
The Yak3 is light, and maneuverable above a min speed (sorry I forget which)... below this speed it's a dog and very unstable - you will stall easily way above stall speed.
In comparison the FW is a lot more stable, and more controllable at the Yak3's min speed.. and it can nail you if you cannot control your plane... of course the FW guy has to know his plane as well
I have 3000+ hours in an IL2 FW.. and a lot of on-line DFs have been won lo-n-slo (a lot of yak3's and La5&7s.. also Spits) coz they were impatient/greedy
Keep the Yak3 fast and you'll be OK... play for time and if the FW tries to follow you he's dead meat... but never for one moment think that you 'have him' when on his 6...!!
Aim for the Pit (PK)... I always do.. every other hit is luck..
Actually ran up IL2 yesterday with some Zero action for fun.. it's been years
Still haven't lost my touch... but hey!! good pilots don't
https://www.dropbox.com/s/mtqm8j6psz...o0_1.mp4?dl=0/