We had success pulling.  We put 2 of our best players at guards this past year running the Wing-T.  One thing we did a little different though is when the pullers were pulling into the 2nd level we never specified who he was to block.  We always found that the players would only seek that guy and pass up blocks too many times.  Our guys were told to maintain their blocking "line = path of the blocker" and block anyone close to the "line" as they worked the play.  The backs had to stay disciplined and read the pullers but it worked out tremendously well for us.

I'm not saying your selling us on anything. What I am trying to point out is that you haven't pulled linemen. What I recommend is that you teach one blocking scheme on top of what you already do that includes linemen. Than after doing that for a season you can see the pros and cons with your kids.

I kind of lean toward just doing one thing and really nailing it.  I do a lot of research in the off-season, and attend a lot of clinics, but it's almost all technique/fundamentals and teaching.  I think that as long as you have everyone near the ball accounted for, one way or another, it's pretty much just a question of whether your kids can execute their blocks or not.  And that comes down to knowing fundamentals and techniques and being able to teach them.