Hate to say it, Soulz, but it's just going to take practice.  I liked Shane's and United's descriptions of "Riding the Tunnel", but I imagine it's something we can do because we've been doing it for a long time.  Boy, I remember back when I was first starting out in AW, I spent a WHOLE lot of time unconcious.
     One thing is to work on knowing what your speed is.  Just before you merge, make it a habit to check your speed.  250 or more and you can pretty much guarantee a blackout from a hard turn, so you can be prepared to be a tad more tender on the stick, "Riding the Tunnel".  Pull gently until the tunnel vision starts, then practice gently holding just a narrow tunnel.  After that you can practice holding the enme fighter in that tunnel.
     If you have more E than your target, use a lag turn and you can still come out of it with the speed to close on him.  You don't always have to turn inside.  Or a high yo-yo if you want to bleed speed, stay conscious and still stay with your target.
     Being a pony driver, I rather enjoy high speed turn fights.  It's amazing how many spit, La and 109 drivers assume they can automatically out turn a pony.  At speed, however, and gently riding the tunnel, I can often out turn them.
    Practice, practice, practice.