I used the smaller Bento Box (branded "Bento Box") and not the AKona version or any of the variations. It was what I had available at the time but will test everything I can when I do follow up testing this spring.
In terms of the additive improvement, I unfortunately didn't have enough wind tunnel time to do all of the permutations of combining products. My theoretical assumption would be that using both together would give you some improvement, but probably less than the sum of the two. The products I'm designing will be made to work together aerodynamically -- so look for some things to follow the production of top tube aero bottle.
The Chrono was less aero than the bike and rider alone -- i.e. it did not improve the aerodynamics of the bike. However, if you compare it to a normal water bottle, it was significantly better. When Landis did testing, he focused on placing the bottles near the bottom bracket (this is an assumption based upon what he's using now -- if anyone knows about the specifics of his test, please correct me). His BMC has water bottle bosses very low on the DT to allow for the bottle to act as a fairing between the DT and ST. On my P3, there was a large gap between the bottle and the curved ST. Thus, I wouldn't expect any improvement. On Landis' bike though, this improvement makes sense.
I hope this makes sense and answers your question :) Keep 'em coming and I'll do my best to answer whatever curiosities you may have.
MIT Center for Sports Innovation
Specialized Bicycle Components