Basswood is one of my favourite arrowshafts. I use it for bows right up to 150lb with no problems. It works well, spines well and finishes well. You might need to go slightly larger diameter than you're used to, but that's a small price to pay for such a light, strong arrow.
I use 12mm basswood for bows up to 120lb, and 12.5mm for bows up to 150lb. It's actually very similar to aspen in both weight and average spine.