I'll just add - one danger with an even front is the first sound QB sneak - I LOVED running that play with that age group, the D was just never ready for it. We always felt like we needed a N because of that - any time we had A gappers, a QB would be able to split them. Bad coaching, yes. But something to think about.
Second thought - we also tried the small quick kids at N, and ultimately they didn't work for us. Again, at that age group, many offenses are built from the ball out. I know mine was - I always had my best linemen at C and G for exactly that reason, I couldn't afford to have the D onto the ball that fast. So my O was NEVER bogged down by a N. And that was our experience against other teams on D, we could never get penetration up the middle. Frankly, the snap itself is such an iffy thing at that age, that coaches really pay attention to it, and over compensate to protect that position.
If I was going to do this age group now, I'd strongly consider running JJ's 33 in GRIM RED (two Reapers, no middle stacker, and the outside stacks reading as OLB's but playing very aggressively). I'd roll the CB's up a bit too since my two R's would essentially be the S's. Again - my priority would be outside edge, then off tackle, then up the middle. If I had the talent, I'd put a good N there that could bull rush the C and control the QB sneak. If not, then I'd have a couple of okay players there and teach them to crap/cut the C to create a pile in the middle.
And Jack's 63 would be my fall back if I felt like I needed to use two A gappers instead of a N.