This particular sorbet took several iterations to get right. Our first attempts weren't very systematic, but we finally took a slow-and-steady approach to iterating on this and now we have a fantastic sorbet to share.
We tried this with varying amounts of lime juice, sugar, lime zest as well as with raw, grilled, and sous vide pineapple. Several different iterations are good, a few were the best, and we are sharing the best here.
In particular, we found that the agave nectar (or corn syrup) is necessary; it allows the sorbet to be smoother and less grainy than just pineapple. Incorporating lime juice will enhance the pineapple flavor, so it's highly recommended.