I sharpen skates for a bunch of my kid's teammates, a few of my fellow coaches, and a fair number of other guys around and I've definitely noticed that some steel burrs more than others.
I've always been able to deburr adequately, but being a nerd at heart, I got interested in this phenomenon and started poking around on the internet and found the weird world of hobbyist knife makers. Those guys are fanatical about steel and go into agonizing detail about it; which, closet nerd or not, turns out to not be all that interesting unless you have a burning passion for chemistry and metallurgy.
Anyway, I learned that, all other things being equal, some compositions of steel are simply more prone to developing edge burr than others. Since we can't exactly change the formulation of our skate steel, there's nothing we can really DO about it as skate sharpeners/Sparx operators - we just have to deal with it.
In general, I've found that if you sharpen with fewer passes more frequently, you'll deal with WAY fewer burrs than if you're running a bunch of passes, less frequently. Put differently, since you've found the Step burrs more easily than the LS2, consider sharpening twice as often with 1/2 the passes. That way, any burr that forms will be smaller and easier to deal with.
Sparx has a good writeup on its website about burrs - worth a read if you haven't already...
http://blogs.sparxhockey.com/how-burrs-occur-on-skate-steel-and-how-to-mitigate-them