I agree with the Dude. I think it’s part of normal cornering. Also, if you come off the brake before the turn, the suspension unloads before loading up as you enter the turn - so less grip and composure. By trail braking you keep the suspension loaded coming gradually off the brake as you tip the bike in with the bars, thus maintaining plenty of grip on the front wheel.
Sorry VNA, but that's completely the opposite to everything I've been taught at racing schools numerous times over the last 30 years, what is currently taught, and what has been written in riding and guides for many years. Trust me, the Ron Hallam Racing School, California Superbike School and the other all tell you NOT to brake while leaned over into a corner.
Get your braking done before you turn-in, while the bike is basically upright. The very last thing you want to do is suddenly load or unload the brakes and suspension while leaned over - the changes in loads upset the suspension and change the stresses on the tyres whilst leaned over and basically cause people to fall off.
A brusque Yorkshireman who was also a top racer on both Road Courses (like the IOM TT) and Race Courses once told me at a racing school class that my "trail-braking" that I thought was the way to get my speed down in a corner was me "lining myself up for an early grave".
On the roads and generally on the track (except at the highest levels of skill) riders trail-brake because they get a corner wrong, entering. turns too early and then trying to slow down once in the corner.
My advice to Steve is to NOT ask such questions on a forum of street riders and amateurs, but go to a race school and get help from the professionals.
Running wide coming round corners is usually a result of the wrong line (known as tight-in, wide-out) and not looking at the exit point. Following the wide-in, tight-out approach to cornering, using late turn-ins (giving the opportunity for later, stronger, upright braking) initiated by counter-steering and going from a neutral throttle to gradual acceleration through the corner is what I have been taught is the right way to corner - and from my lap-time improvements, it really worked.
Not only that, the wide-in, tight-out approach means you have greater visibility around a corner, more time to react to obstacles and you can see your exit earlier - meaning you are riding more safely, even if faster.
As I said a couple of sentences Steve, don't take my word for it, or anyone else's, unless they're a professional - this is your life you're playing with (especially if you're going to try to ride harder/faster on the roads by trail-braking more !!) - go to a proper track school (not a Track Day, a School session) and get professional advice - it might just save your life !!!