I'd think you'd need around a 30# spined cedar and a 125grain point, if you go with a 28" arrow. If you want to go with a shorter arrow, go up a step in point weight for every inch shorter. So for a 27" arrow, use a 145gr point. For a 26", go with a 160gr point. Alternately, you can drop a spine group for each inch shorter, but I think you might have a hard time finding shafts under 30# in spine.
For the 1816s, you'll probably be close with 145 grain points at 28.25". Again, if you want to go shorter, go up a step for each inch you shorten.
If you want to try carbons, a good place to start would be the Gold Tip 1535s. Get a selection of points all the way up to 250 grains. Of course, you'll need to go through the tuning process, but I'm betting you'll need a lot of weight up front, 200-250grs.