Just for the record I've never seen any lag in AC6, at least nowhere near as bad as people here claim.
Regarding missile performance, it relies almost entirely on who gets the ESM support. Or how good you are at cross the map SAAM spamming.
Lucky you, lol I saw lag every game I played * and it's not my own net either *. The lag also included the planes performing rigid like 45 degree rolls and such in the little target window. One reason I never do 1V1's: the netcode/lag is so bad the person will be looking away from you but you'll get hit with 2 SHOOT missiles from their screen and vice versa.
As for tips... well, to stay alive the broken corkscrew-like move always works (hold rudder one way, roll the other and go full speed) unless you hit a lag spike. Even SAAMs miss. I say broken because normally a missile would aim towards where the target would be and not following its exhaust trail (especially radar guided missiles) but since in this game it does, it breaks missiles lol.Granted, When doing that corkscrew you have about 5 QAAM spammers following you along with their pretty missile spam but usually helps at least.
As for killing people, PC pretty much got it right on. SHOOT missiles almost always miss unless the person stalls, lags badly (most common cause for getting hit with them), or doesn't know what they're doing. Once in a while you'll get lucky though, especially if you get as many SHOOTs as possible on someone. SAAMing is a bit of a bitch as well at closer ranges because of the lag/netcode problems. Further the way you are, the less likely the warping will affect your aim in the circle. Unless of course you feel like doing what I do sometimes and SAAM a guy in a circle fight with you lol. Pretty much a good rule of thumb is fire the secondaries as far off as possible, since they have more time to adjust for the warping.