My older son and I both suffer from this also, especially my son. He's 6'4" with a long torso, and all of the current Scouting America or leftover BSA shirts are too short for him to tuck in, most only reach his belt with his arms at his ides by about 1". Unfortunately, the "Made to Measure" is cost prohibitive for a still growing 14 year old, at $170 per shirt, more than 3 times the cost of the already expensive stock uniforms. From what we could tell in store, the length doesn't seem to change really from L through 4XL, only the other dimensions change. I wear a 2XL, and have the same problem as he does, just to a slightly lesser extent, as I'm only 6'3", I can tuck in about 3" of the shirt, although mine is also an older uniform, it's cut longer compared to current uniforms.
Official pants are the same problem. The unhemmed inseams on the non polyester pants are all 36". He currently wears a 38" inseam, and I wear a 40" Inseam. The Made to Measure at $174 are again, cost prohibitive.
At this point I think we may have to add insignia to a 5.11 tactical shirt, and go non BSA for the pants also. Looking at his troop, almost all of the scouts over 13 don't wear the BSA pants, as they are too short.