Extra long poles aren't a problem - just use them like cross country ski poles. On flat sections, just plant the tips just behind your heels. On uphill sections, plant the tips near the front of your instep. This way you don't have to fuss with adjustments, and the angle helps push you up the hill or forward along the flats. On downhill sections, the extra length helps you slow down & brace much easier - also with no adjustments needed.
To use my poles like this, I like the length to come up to just under my armpit. For very rugged terrain, a couple of more inches (to the top of my shoulder) is better, but for 90% of the terrain armpit length is best. Sizing them for elbow length doesn't allow me to get any "push-off" on uphills or flats, since they are straight up and down. And even with the BD flicklocks, I perfer not to have to make adjustments.
That said, I only use my poles on weekend "conditioning hikes" where I'm going for speed, or adventure racing where I want to run off trail or on rugged trails with more safety. For long treks with a pack, I leave the poles at home because they use more energy, are bothersome when I'm tired, and I don't need them for stability on even semi-rugged trails (ie: trails with rocks every 1-2 feet that are 6-9 inches tall, and have slopes not much more steep than the stairs in my house). The key to not needing poles for backpacking is to get the center of gravity in your pack right so it doesn't cause you to lean forward to counter-balance it.
For heavy packs I still think poles are a great help for knees and lower backs though.