DLE-55 would do fine without a pipe for general 3D and sport flying. I have a GP-61 on a Smooth Pipe on my Yak, and I would totally recommend that pipe for your plane, unless cost is an issue. I have ridiculous amounts of power but I also fly with a 32 oz tank and have the extra weight of the pipe and dual batteries. Keep it light and you could get away with it for sure!
By the way, I love the way it flies with the small SFGs and angled wingtip blocks. High-speed flying is totally improved and feels like flying with big SFGs, but low speed is more like a traditional wing without SFGs. The wing stalls perfectly in harrier and is perfectly stable, and they don't mess with forward slips. I feel like the bigger ones trap more air on the wing and make it tend to tip stall more violently with rudder input.