Very nice DL... I'm in the same boat with ours and have bounced around what you're doing (either with that device or just adding a T connect or elbow to raise it a couple feet). Ours is around 6' so just adding a couple feet would do wonders. However, I'm really close to just breeching our dam shortly and draining it completely. Then over the next year or two get in there with a dozer and/or excavator to work the thing over well. You have a little more room to raise than I do... otherwise I'd go your route for sure. Best wishes!
